British far-right activist Tommy Robinson was stopped and questioned by police at London’s Heathrow Airport on Saturday after arriving on a flight from Russia. Robinson reports that officers also seized two of his mobile phones. He was detained for nearly three hours while authorities investigated him under security legislation designed to detect hostile activity. The specific reasons for the scrutiny remain unclear, but the detention occurred shortly after his return from Russia. Robinson informed The Guardian newspaper about the incident. Authorities have not yet released an official statement regarding the matter.