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BBC news with Fiona McDonald.

President Trump has set out a new national security policy, stressing the America's first strategy of his election campaign. He referred to China and Russia as rival powers,  challenging the U.S on the world stage, and said U.S will seek to build parterships but in the way the protected U.S interests.

Mr.Trump's homeland security adviser publicly accused North Korea of carrying out the WannaCry cyberattack, which affected computer systems in more than 150 countries in May. Writing in the Wall Street Journal, Tom Bossert said Pyongyang was directly responsible.

There has been more violent protests in the Argentina captial Buenos Aires where congress is trying to pass pension reforms. Demonstrators say the plan changes will lead to the poorer people working longer for lower pension.

Officials in the U.S state of Washington have said three people are known to die when a train plunged off a bridge and crashed onto a motorway. About 100 others have been taken to hospital.

An international study has suggested rubber bullets are too dangerous to be used for crowd control. Research published in the British medical journal found that 3 in every 100 people injured by rubber or plastic bullets died in their wounds.

The governor of Puerto Rico has ordered the review of all death in the U.S territory since hurricane Maria struck in September. News organizations have estimated more than 1000 deaths can be attributed to the storm.

And anti-doping officials are investigating allegations against two men linked to the World Champion sprinter Justin Gatlin. The Daily telegraph paper in Britain says athlete agent offered to supply performance enhancing drugs to undercover reporters. Gatlin's coach allegedly said doping was possible because drug used wouldn't be detected. Both men denied the accusations.

BBC news.