Chief Whip Andrew Mitchell has admitted that he did swear at No 10 police officers - but he insists he did not call them "plebs", it has been claimed.
The Tory enforcer concedes that he said "f******" when a member of Scotland Yard's Diplomatic Protection Group, SO6, refused to let him cycle out through the main Downing Street gates, according to the Sunday Telegraph.
Mr Mitchell is reported to have said: "Look, I'm the chief whip, I work at Number 9 (Downing Street)," before muttering: "You guys are supposed to f****** help us."
A friend of the minister told the newspaper: "He does not dispute he lost it a bit.
"It was in frustration at the episode and not aimed directly at the officers. It was the fourth time he had been at Downing Street that day - he is frequently allowed to use the main gate on his bike. He is absolutely not accusing anyone of lying."
It comes just a day after Mr Mitchell issued a statement denying using "any of the words that have been reported".
The friend added: "He realises there may be differing versions of what was said, but he is adamant he did not use the words he is reported to have used,"
Mr Mitchell has faced calls to resign over the tirade, which proved acutely embarrassing for Prime Minister David Cameron when details emerged as he headed to Manchester to pay his respects to murdered Pcs Nicola Hughes and Fiona Bone.
Mr Cameron was told to take responsibility for the Tory enforcer's behaviour by the widow of murdered police officer Sharon Beshenivsky and Labour called on him to "urgently" review the evidence
Conservative Nick de Bois had warned earlier that Mr Mitchell was in "deep trouble" if evidence emerged disputing his version of events.