A 23-year-old man from Central Asia is believed to have been behind two bombs on the St Petersburg Metro.

He is believed to have links to radical Islamist groups.

At least 11 people were killed and dozens were injured in what is believed to have been a suicide attack.

Donald Trump has offered Russian President Vladimir Putin the full support of the US.

Three days of mourning have been declared in St Petersburg, where these people live.

Russian Security Expert Domatilla Sagramoso says there's been a big effort recently to tackle terror groups: