A shadow cabinet minister reportedly punched a wall after a key section of his Labour conference speech was altered by an aide to Jeremy Corbyn.
Shadow defence secretary Clive Lewis had been due to say that he would not seek to change Labour's policy of supporting the renewal of Trident.
But the Politics Home website said Mr Corbyn's strategy and communications chief Seumas Milne watered down the message.
Mr Corbyn is a long-standing campaigner for nuclear disarmament and opposes the renewal of the Trident system.
In his speech to the Labour Party conference in Liverpool, Mr Lewis said: "As you know, I am sceptical about Trident renewal, as are many here.
"But I am clear that our party has a policy for Trident renewal."
He had reportedly wanted to go further but the reference to not seeking to change that policy was removed at the last minute, with Mr Lewis notified as he sat on stage waiting for his speech at the gathering in Liverpool.
A senior Labour source told the website: "Clive punched a wall when he came off the stage because Seumas altered his speech on the Autocue.
"He was fuming as he sent a Post-It note on stage as he was sat there ready to speak and didn't know what the exact change was. Apparently Clive had agreed it with Jeremy but Seumas changed it."
Video footage of Mr Lewis on stage before his speech shows him apparently engaged in a text message exchange before puffing his cheeks out and looking pensive.
A spokesman for Mr Corbyn told the Press Association: "All speeches are agreed with the leader's office.
"The Autocue reflected what was agreed and Clive was notified of this."
Before reports of his display of temper emerged, Mr Lewis had insisted he was "very happy" with the speech he delivered, telling the Press Association: "All speeches have amendments and changes.
"Where it starts out and where it ends up is always going to be a process of change."
He did not immediately respond to a request for a comment over the alleged wall-punching episode.
Even by restating Labour's existing policy, Mr Lewis was condemned by the Campaign for Nuclear Disarmament (CND), whose vice-president is Mr Corbyn.
CND general secretary Kate Hudson said: "How can Labour claim to work for multilateral disarmament if it supports the Government building a new nuclear weapons system at a cost of £205 billion? This means Labour is supporting nuclear rearmament."
Earlier in the conference Ms Hudson urged CND activists to support a tactic to get Trident on the agenda at the next Labour conference.
The contentious topic has been missing from policy debates at the annual conference for the past two years.
At a fringe event NEC constituency member Christine Shawcroft said anti-Trident supporters must campaign to get activists elected on to the little-known conference arrangements committee (CAC) which oversees the conference agenda.
Ms Shawcroft said: "Next year when the campaign comes round you must support Centre-Left Grassroots Alliance candidates for the CAC.
"Please can everyone vote for them, and maybe then we will get the debate we want on the floor of conference?"
Supporting the plan, Ms Hudson said: "As we're at Labour Party conference, I am sure we are all united that we must get a change in Labour Party policy so that Labour adopts a cancel Trident replacement policy.
"We have to have that long-awaited debate at Labour Party conference next year."
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