Police have been granted warrants of further detention for two people arrested at Heathrow airport over allegations of terrorism and the kidnapping of a British photographer in Syria.
A 26-year-old man and woman were arrested on Tuesday at the airport and were taken to a central London police station where they remain.
More top news
Six people have been injured and a man has been arrested after an alleged noxious substance attack in east London.
The US first lady travelled without her husband to support the Invictus Games, which were founded by the Prince in 2014.
The Pentagon sent a group of military planes just off the state's coast in a show of force.