Two men were arrested and charged with terror offences today, Scotland Yard said.
Mohammed Abushamma, 20, from Islington, north London, and Qasim Abukar, 20, from Tufnell Park, north London, were charged under the Terrorism Act.
Sources said the men were arrested after getting off an inbound flight to Heathrow this morning.
It is believed the charges relate to alleged planned terror attacks overseas.
The charges state that between 17 March and 18 April the men "engaged in conduct in preparation for giving effect to their intention of committing acts of terrorism contrary to section 5(1)(a) of the Terrorism Act 2006."
The men will appear before City of Westminster Magistrates' Court tomorrow.