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Shadow home secretary Andy Burnham says it may be "impossible" for Labour to reach an agreed position on Trident.

Mr Burnham, who backs renewal of the UK's nuclear weapons, said the review by shadow defence secretary Emily Thornberry would be "very difficult".

Ms Thornberry and Labour leader Jeremy Corbyn do not want to renew Trident.

http://www.bbc.co.uk/news/uk-politics-35528108

Ms Thornberry gave Mr Corbyn's senior team of shadow ministers an outline of her thinking last week, but debate on the party's approach was delayed.

She told the Parliamentary Labour Party meeting on Monday she wanted to carry out the ongoing review of Labour policy on Trident in an "atmosphere of mutual trust and respect".

The Labour source told the Press Association that Ms Thornberry had also raised doubts about whether submarines were a safe way to carry the nuclear deterrent.

"She was talking to some people about drones and it was apparent it was absolutely possible that large submarines could be tracked and attacked by drones," the source added.