A BRITISH national journalist was detained by counter-terrorism police when he landed in London’s Luton airport and interrogated over his work for independent news website The Grayzone, it has been revealed.

Kit Klarenberg arrived in London on May 17 from Belgrade, Serbia, where he lives and was detained by six plain-clothes counter-terrorism officers, according to the site.

The officers refused to tell him their names and offered call signs instead.

Mr Klarenberg, who has written multiple exposés on the British government and intelligence services, was taken to a room and interrogated for over five hours over his reports, his employment by The Grayzone and his personal political opinions including the current British leadership and Russia’s invasion of Ukraine.

Police seized Mr Klarenberg’s electronic devices, bank cards and memory cards, fingerprinted him, took DNA swabs, and photographed him.

They threatened to arrest him if he did not comply, The Grayzone reported.

“They asked which publications I wrote for, and I told them I wrote for many,” Mr Klarenberg said.

“Their overwhelming, if not exclusive, interest was in The Grayzone.”

Mr Klarenberg remains under investigation.