LONDON (AP) -- Britain's police watchdog says it has received allegations of potential wrongdoing against four former senior officers in the London force.

The officers include police chief Paul Stephenson, who resigned Sunday, and the top anti-terrorist officer John Yates, who stepped down Monday.

It said there are also claims against two unnamed former senior officers about their roles in the phone hacking investigation.

The Independent Police Complaints Commission said it was looking into the claims.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

LONDON (AP) - Former London police deputy John Yates says he acted with complete integrity in Britain's phone hacking crisis.

Yates was the second high-profile casualty from the Metropolitan Police to resign in the past 24 hours. His resignation earlier Monday followed the decision of his boss, Paul Stephenson, to leave his post Sunday night.

Yates was the official who decided two years ago not to reopen police inquiries into phone hacking, saying he did not believe there was any new evidence.

He expressed his "deep regret" on Monday but said his "conscience is clear."

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