A car rammed the gates of a US Air Force base in Suffolk as gun shots were fired, say Sky sources.
A Ministry of Defence (MoD) source said a man driving a car tried to force the vehicle into the barriers at the entrance to RAF Mildenhall near Bury St Edmunds.
Suffolk Police said shots were fired by American service personnel at the base which was placed on lockdown.
Sky’s Defence Correspondent Alistair Bunkall said: “I have been told by the Ministry of Defence in London that one individual is in custody with Suffolk Police.
“It was described to me as some sort of argument at the base gates. There were reports of shots fired. The situation is ongoing.
Update: It has been claimed that the suspect is a British citizen who pretended to be someone he was not – possibly a senior military figure – to get through a checkpoint.
Twitter – Mildenhall