Metropolitan Police officers subjected suspects to waterboarding, according to allegations at the center of a major anti-corruption inquiry, The Times of London reported on Tuesday.

The interrogation claims are part of a wide-ranging investigation which also includes accusations that officers fabricated evidence and stole suspects’ property. It has already led to the abandonment of a drug trial and the suspension of several police officers.

However, senior police officials are most alarmed by the claim that officers in Enfield, North London, used the controversial CIA interrogation technique to simulate drowning. Scotland Yard is appointing a new borough commander in Enfield in a move that is being seen as an attempt by Sir Paul Stephenson, the Met Commissioner, to enforce a regime of "intrusive supervision."

The waterboarding claims will fuel the debate about police conduct that has raged in the wake of hundreds of public complaints of brutality at the anti-G20 protests in April.

The part of the inquiry focusing on alleged police brutality has been taken over by the Independent Police Complaints Commission. It is examining the conduct of six officers connected to drug raids in November in which four men and a woman were arrested at addresses in Enfield and Tottenham. Police said they found a large amount of cannabis and the suspects were charged with importation of a Class C drug. The case was abandoned four months later when the Crown Prosecution Service said it would not have been in the public interest to proceed. It is understood that the trial, by revealing the torture claims, would have compromised the criminal investigation into the six officers.

None of the officers under suspicion has been arrested, but the IPCC said last night: "This is an ongoing criminal investigation and as such all six officers will be criminally interviewed under caution."

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