AN UNDERCOVER Daily Mail journalist was among seven people arrested at a non-violent training event organised by Take Back Power, the activist group revealed today.

Dozens of officers arrived at Millman Street Community Centre in London at around 12.30pm on Saturday.

Scotland Yard said the event was part of “plans for mass shoplifting and the unlawful occupation of shops” and seven people were held on suspicion of conspiracy to commit theft before being released on bail.

Police also raided the home of a Take Back Power supporter at 3.20pm. The 25-year-old handed himself in after finding out there was a warrant for his arrest. Police, however, raided his home again at 2am today, said the activists.

Take Back Power activists threw apple crumble and custard at the Crown Jewels in December.

Deputy Assistant Commissioner James Harman said: “There is a clear difference between lawful protest and criminal acts.”