An Islamic State terrorist who plotted to kill Theresa May has been jailed for at least 30 years, The Guardian reported.

Naa’imur Zakariyah Rahman, 21, who had pledged allegiance to Isis, planned to bomb the gates of 10 Downing Street, kill guards and then attack the prime minister with a knife or gun.

Rahman, from Finchley, north London, was snared by a network of undercover counter-terrorism officers from the Metropolitan police, the FBI and MI5. He was found guilty of preparing acts of terrorism despite claiming that he was set up.

The drifter, originally from Birmingham, was collecting what he thought was an explosives-packed jacket and rucksack when he was arrested last November. He thought he was being helped by an Isis handler when in fact he was talking to undercover officers.

Rahman was sentenced to life in prison with a minimum term of 30 years. For the Isis sponsorship video, Rahman was handed six years in prison to run concurrently.