:00:21. > :00:23.More now on the terrorist attack at Westminster.
:00:24. > :00:26.Ever since 7/7, Londoners have been aware that the capital city will
:00:27. > :00:30.Tonight as another difficult day draws to a close,
:00:31. > :00:33.the reality of that threat has been brought home again with an attack
:00:34. > :00:37.And as this footage shows, the attack began with a car
:00:38. > :00:39.driving along the pavement on Westminster Bridge.
:00:40. > :00:41.Numerous people were mowed down - one woman fatally -
:00:42. > :00:45.She was later pulled out alive, but is tonight
:00:46. > :00:48.Tonight, there is extra security on London's transport system
:00:49. > :00:50.and armed police remain on the streets.
:00:51. > :00:53.Our Home Affairs Correspondent Nick Beake is at New Scotland Yard -
:00:54. > :01:08.Yes, this is the day that London was preparing for, but hoping it would
:01:09. > :01:13.never see. We knew that our city was a prime target for those who would
:01:14. > :01:16.do us ill, but today someone was able to get through and strike with
:01:17. > :01:22.fatal consequences. Tonight, Scotland Yard is at the heart of the
:01:23. > :01:25.investigation for a number of reasons. First of all, the
:01:26. > :01:28.Metropolitan Police is in mourning. It has lost one of its own and
:01:29. > :01:33.tonight, it has been announced that Keith Palmer, a 48-year-old officer
:01:34. > :01:37.who had been with the Metro 15 years, was the unarmed officer who
:01:38. > :01:46.was killed today. He was a father and husband. We are now seeing the
:01:47. > :01:50.Met's counterterrorism operation in full swing but for Londoners, there
:01:51. > :01:55.will be consequences. Lots of Westminster is still remains in
:01:56. > :01:58.lockdown. Parliament Square, Whitehall, Westminster Bridge,
:01:59. > :02:03.Lambeth Bridge, Victoria Street, Victoria embankment are all places
:02:04. > :02:07.which are tonight closed down or stop I mentioned the bridge to my
:02:08. > :02:12.right, the scene of one of the horrific events today. Our reporter
:02:13. > :02:14.Louisa Preston has been talking to someone who witnessed what happened.
:02:15. > :02:24.I heard a scream and to my left, there was a car driving down the
:02:25. > :02:30.road quite quickly. Then it careered into some pedestrians. It looked
:02:31. > :02:33.like it ran through a red light and went into a bunch of pedestrians.
:02:34. > :02:37.Three of them went flying into the air. It knocked them down like
:02:38. > :02:44.skittles. Then he carried on going down the road about 100 yards, and
:02:45. > :02:51.then he turned left into the House of Commons, tried to crash into it.
:02:52. > :02:56.I was stunned. I went over to whether people had been hit, and
:02:57. > :03:02.there was a lady quite... She was unconscious. There was a man in a
:03:03. > :03:07.lot of pain and screaming, a bit of blood. And there was another lady
:03:08. > :03:10.who had her legs broken. I was just holding her hand for a while until
:03:11. > :03:20.the police and the ambulance came. The people on the ground were badly
:03:21. > :03:25.hurt. It was shocking. And you sat with the lady for quite a while.
:03:26. > :03:29.What were you saying to her? She was badly concussed, so she kept asking
:03:30. > :03:33.what had happened. She was convinced that it was her fault. She thought
:03:34. > :03:38.she had crossed the road on a red light or something. But obviously, I
:03:39. > :03:42.realised, because my light was green and I was crossing the road, so it
:03:43. > :03:45.meant the guy had gone through a red light. So I was trying to calm her
:03:46. > :03:51.down and she was screaming in pain because her leg was broken. The
:03:52. > :03:54.police and paramedics were running past her and I kept trying to signal
:03:55. > :03:59.them to give her some first aid and stuff, but they had done a triage on
:04:00. > :04:03.her and decided she wasn't one of the worst ones, so she had to sit
:04:04. > :04:06.there for a good 20 minutes while they were running around. There were
:04:07. > :04:09.loads of paramedics, but they were attending to other people, so it
:04:10. > :04:13.took them quite a while to get to know.
:04:14. > :04:15.We were always told another terrorist attack here
:04:16. > :04:18.in London wasn't a matter of if, but when.
:04:19. > :04:22.So keeping London safe has long been a key priority for the Mayor.
:04:23. > :04:24.Let's cross now to our political editor Tim Donovan, who's
:04:25. > :04:35.Even if you thought all feared it was going to happen, the challenge
:04:36. > :04:40.is now how to respond to it. The mayor has said his heart goes out to
:04:41. > :04:45.the loved ones of those who died or were injured on that bridge, random
:04:46. > :04:50.and in the wrong place at the wrong time. He has talked about the loss
:04:51. > :04:55.of a police officer doing his job. And there has been the need for
:04:56. > :05:01.reassurance. He posted a video he recorded here at City Hall on social
:05:02. > :05:05.media today. Londoners should be aware.
:05:06. > :05:08.Londoners should be aware that there will be additional armed
:05:09. > :05:10.and unarmed police officers on our streets from tonight in order
:05:11. > :05:13.to keep Londoners and all those visiting our city safe.
:05:14. > :05:16.I want to reassure all Londoners and all our visitors not to be alarmed.
:05:17. > :05:18.Our city remains one of the safest in the world.
:05:19. > :05:21.London is the greatest city in the world, and we stand together
:05:22. > :05:24.in the face of those who seek to harm us and destroy
:05:25. > :05:33.Londoners will never be cowed by terrorism.
:05:34. > :05:39.That refrain we had heard a lot. It was a question of when and not if,
:05:40. > :05:44.designed in itself to be reassuring because it had a kind of solemn
:05:45. > :05:48.realism about it. We are not going to give you false security and we
:05:49. > :05:53.want you to be vigilant. It was based on intelligence not of an
:05:54. > :05:57.imminent attack, but based on what had happened in Western Europe.
:05:58. > :05:59.London was prepared, or said it was, as Karl Mercer reports.
:06:00. > :06:04.Just four days into his new job as mayor and Sadiq Khan,
:06:05. > :06:07.like other city leaders before him, was seeing how the Met Police train
:06:08. > :06:11.Since August 2014, the capital, and the country, have been
:06:12. > :06:14.on the second highest terror alert, an alert warning that
:06:15. > :06:30.He asked Lord Harris to conduct a review of how well London was
:06:31. > :06:37.prepared for an attack. We spoke to him tonight. Having looked at this
:06:38. > :06:40.in detail only a few months ago, the reality is that this was something
:06:41. > :06:48.that clearly, we had to expect in some form. I am pleased that it
:06:49. > :06:51.looks as though all the emergency and contingency plans seem to have
:06:52. > :06:54.clicked into place in the way you would expect.
:06:55. > :06:56.Among his recommendations, that more bollards are put outside
:06:57. > :06:58.public buildings like the ones installed outside Parliament back
:06:59. > :07:01.in 2005, but also a recommendation of more armed response officers
:07:02. > :07:05.In August last year, the Met announced it was recruiting
:07:06. > :07:08.a further 600 armed officers to deal with the threat.
:07:09. > :07:11.This is not giving every police officer in Britain a gun.
:07:12. > :07:14.It's not giving everybody even in the Met a gun.
:07:15. > :07:16.A controversial show of force for the announcement, perhaps,
:07:17. > :07:23.but it appears this unit may have been deployed today,
:07:24. > :07:26.the van they are in front of here clearly visible
:07:27. > :07:27.on Westminster Bridge after the attack this afternoon.
:07:28. > :07:31.London, of course, has been on high alert since the events of 7/7,
:07:32. > :07:33.when 52 innocent people were killed after terrorist attacks
:07:34. > :07:38.As the terror threat has developed, so have the warnings from senior
:07:39. > :07:45.If you hear gunshots, the best option is to evacuate.
:07:46. > :07:47.Two years ago, this video, warning people how to behave
:07:48. > :07:54.if there was a terrorist attack at work, was put out by police.
:07:55. > :07:56.I think anyone seeing the intelligence we're seeing
:07:57. > :08:02.The reach of people overseas trying to influence people in the UK
:08:03. > :08:08.They've warned that it was a matter of when, not if,
:08:09. > :08:22.Today, it appears they've been proved right.
:08:23. > :08:27.There was a meeting of course this evening of the committee Cobra,
:08:28. > :08:32.which meets in circumstances like this. After it, the Prime Minister,
:08:33. > :08:36.who chaired the meeting, talked of the need for resilience and
:08:37. > :08:43.normality. Tomorrow morning, Parliament to meet as normal. We
:08:44. > :08:46.will come together as normal. And Londoners and others from around the
:08:47. > :08:53.world who have come here to visit this great city will get up and go
:08:54. > :08:57.about their day as normal. They will board their trains. They will leave
:08:58. > :09:03.their hotels, they will walk the streets. They will live their lives.
:09:04. > :09:08.And we will all move forward together, never giving in to terror
:09:09. > :09:20.and never allowing the voices of hate and evil to drive us apart.
:09:21. > :09:25.Today, we know we have lost a police officer named as Keith Palmer. A
:09:26. > :09:35.picture has been released of him fairly recently. We are told he is a
:09:36. > :09:41.48-year-old father and husband. We know little more about him at this
:09:42. > :09:45.stage. This was something that people were not expecting, even if
:09:46. > :09:51.they said that it was something that was to be expected. While there may
:09:52. > :09:59.have been a defiance about this attacker or silent attacking at the
:10:00. > :10:02.heart of democracy, it might be difficult to find reassurance and
:10:03. > :10:06.that, given that it has been the most heavily armed, one of the most
:10:07. > :10:09.heavily armed parts of central London. Many questions will follow
:10:10. > :10:11.over the next days and months. We will of course have more updates
:10:12. > :10:15.and reaction to today's events from our breakfast bulletins
:10:16. > :10:18.from 6.30 in the morning. Let's cross now to Jay Wynne,
:10:19. > :10:27.with a look at the weather. It may be a slow start of the day
:10:28. > :10:31.tomorrow, but things should gradually brighten up. We will see
:10:32. > :10:35.sunshine getting through from the late morning onwards. Overnight
:10:36. > :10:41.tonight, it is on the wet side, rain coming from the West - sorry, from
:10:42. > :10:45.the east. By the end of the night, the brain is becoming lighter and
:10:46. > :10:49.more patchy and it is rather chilly. It may start damp for some, but it
:10:50. > :10:54.will brighten up as we get into the afternoon and we should see
:10:55. > :11:00.temperatures peaking at around 12, 13 or 14 degrees. Friday should be a
:11:01. > :11:02.decent day. Saturday could be a much better day, with some sunshine.
:11:03. > :11:18.It certainly was a pretty wet day across parts of the country, lots of
:11:19. > :11:22.downpours around. This is a picture from Kent, not particularly nice. We
:11:23. > :11:26.still have some rain on the way for tonight. Tomorrow morning, some of
:11:27. > :11:27.that when we'll be lingering, but there is sunshine on the way