Will Lewis, now the publisher of the Washington Post, was in full crisis mode in 2011. Then an executive at Rupert Murdoch’s News Corporation, he was an intermediary to the police detectives investigating a British phone-hacking scandal that had placed the company’s journalists and top leaders in legal peril.

For years, reporters at News Corporation’s best-selling British tabloid had landed scoops by paying public officials and illegally listening to the voice mail messages of royals, politicians, celebrities and even a murdered girl. Mr. Lewis was supposed to cooperate with police, identify wrongdoing and help steer the company through the crisis.

His role, he would later say, was as a force for good. He was “draining the swamp.”

But confidential documents obtained by The New York Times and interviews with people involved in the criminal investigation show that, almost from the beginning, investigators with London’s Metropolitan Police were suspicious of News Corporation’s intentions, and came to view Mr. Lewis as an impediment.

The police suspected that News Corp. was trying to “steer the investigation into a very narrow remit” by pointing the finger at a few journalists “while steering the investigation away from other journalists and editors,” one of the lead detectives wrote in a previously undisclosed internal summary of events.

Scotland Yard detectives were shocked to learn that the company had deleted millions of internal emails, despite notices from a lawyer for an alleged phone hacking victim and the police explicitly asking that any documents related to the investigation be preserved, according to police records and interviews with investigators.