Scotland Yard has confirmed that two men have been arrested on suspicion of terror offences. One, aged 50, was held in Westminster, central London, on suspicion of encouragement of terrorism and possessing information useful to persons preparing or committing acts of terrorism.
The second, aged 57, was arrested in Barnet, north London, on suspicion of encouragement of terrorism.
More top news
Barack Obama and his wife Michelle have exchanged Valentine's Day messages on the The Ellen DeGeneres Show.
Republican presidential candidates have taken part in a fiery debate as they clashed over foreign policy and immigration.
The £15 'liquid biopsy' looks for fragments of genetic material in a tiny drop of saliva.