02/04/2016 BBC Weekend News

President Obama has warned that the possibility

of so-called Islamic State obtaining a nuclear weapon

is one of the greatest threats to global security.

Speaking at the end of a nuclear security summit in Washington,

he insisted that concrete steps must be taken

to prevent nuclear terrorism, as Sophie Long reports.

Good afternoon, everybody. If we could get started...

President Obama said they gathered here not just to talk but to act.

More than 50 world leaders came together.

They pledged to do more to stop nuclear terrorism -

attacks that he said would change our world.

At the forefront of his mind, the so-called Islamic State,

the organisation already accused of using chemical weapons in Syria.

There is no doubt that if these madmen ever

got their hands on a nuclear bomb, or nuclear material,

they most certainly would use it to kill as many innocent

And that is why our work here remains so critical.

The single most effective defence against nuclear terrorism

is fully securing this material so it doesn't fall into the wrong hands

The world leaders also expressed concern at the prospect

of North Korea developing a workable nuclear weapon.

Pyongyang test-fired a missile during the Washington summit,

underlining its determination to go its own way,

and blamed the US for the tensions on the Korean Peninsula.

The United States is trying to turn the white into black,

describing as if the counter measures taken by the government

of the DPR Korea is a provocation, is a threat.

They said it is a threat and a provocation,

Much will depend on the attitude of China's President Xi.

He was urged by Barack Obama during the summit

to impose new sanctions and put pressure on Pyongyang

to end their nuclear weapons programme.

This is the last of these summits in their current form

as President Obama prepares to leave office.

He said they had made meaningful progress

As the summit closed, they reaffirmed their commitment

to fight nuclear proliferation, saying it still posed the greatest

The UK steel industry is coming to terms with another setback,

following the news that China is to impose a 46% import tariff

on certain types of high-grade steel.

Britain is among one of only a handful of countries

which produces the steel, mainly used for electrical transformers.

Let's speak to our political correspondent Carole Walker,

This is terrible news. Making in Britain, but also for the

Government. That is right, and a spokesman at the business department

has said it is clearly unwelcome news but that exports of the

particular type of steel that would be hit from South Wales are only

about 1000 tonnes a year, so the impact on British industry is likely

to be minimal. Nonetheless, this is embarrassing for the Government,

particularly as the Chinese simply slapped on these new tariffs within

hours of David Cameron raising concerns about the issue when he met

President Xi at that nuclear summit in Washington. And as the Government

is facing accusations that it is not taking sufficiently robust action on

the steel issue because it is more concerned with wooing Chinese

investment in other industries. It does, of course, underlined the

speed and the scale with which other countries are acting to save their

own steel businesses at a time that Britain is not only trapped in this

rather slow and cumbersome EU process, but has argued against some

higher tariffs because it says they would hit other parts of British

industry. Certainly, there are many in the steel business here to say

the Government cordoned should do more if it is to save the British

steel industry and keep alive the prospects of finding a buyer for the

huge steel plant at Port Talbot. Carole, thank you.

The Syrian Army says it's discovered a mass grave with around 40 bodies

in the city of Palmyra, according to state run media.

Palmyra was recently recaptured by government forces

from the so-called Islamic State jihadist group.

International monitoring groups say IS was reported

to have killed a number of civilians and soldiers some time ago.

Three employees of an Indian construction firm

are due to appear in court today, charged in connection

with the collapse of a flyover in Kolkata on Thursday.

as a section of the flyover fell onto the road below.

Five other staff from the company are being questioned.

There are concerns that neither Greece or Turkey are properly

prepared to begin the return of migrants from the Greek Islands

The deportations follow a EU agreement to try and stem the flow

of migrants into Europe from Syria and elsewhere.

Our correspondent Mark Lowen is in Dikili, northern Turkey.

He joins us by webcam. Mark, how prepared is Turkey for what is a

very complicated process? It is a huge task, Gavin, it does not seem

that it is prepared at all. We are in Dikili, just across the Aegean

Sea from Lesbos, where the first batch of 500 migrants are supposed

to arrive on Monday, but we have been to the field which has been

earmarked as the registration centre, and there is nothing there

at all. Added to that, there is a lot of anger from locals at the idea

of any camp at all, and there was a protest in the main square about an

hour ago by people saying they do not want a refugee camp. Local

people are saying they could stay here temporarily before being

relocated to other parts of Turkey. And there are real concerns among

aid agencies and EU countries that those being sent back could have

their rights violated if they are sent back to their countries of

origin. It is a mad panic rush to meet the Monday deadline and major

concerns over whether it can work. Thank you very much.

A British woman taking part in a round-the-world yacht race

has died after being swept overboard.

Tributes have been paid to Sarah Young, who was from London.

The founder of the Clipper race said safety was the first priority.

He warned other crews that she was not tethered to the boat,

as the usual safety procedures require.

The fact of the matter is, people have a harness

and don't clip on, they are endangering themselves,

and I'm afraid that's what's happened on this occasion.

You can tell them to harness on, we do the whole time,

but if they haven't done it, I'm afraid this is what can happen.

You can see more on all of today's stories on the BBC News Channel.

The next news on BBC One is at 5:50 this evening.

Hello! Lovely warm Springs signs for some of us today, but for others it

is rather less inspiring, particularly if you are sitting