An investigation into a leaked Labour document on the party's handling of anti-Semitism allegations will report in July.
The party's ruling National Executive Committee agreed to launch the investigation into the leaking of the 860-page report that reignited divisions inside the party on Thursday.
A party spokesman said the NEC would meet again "in due course" to decide who will lead the inquiry.
The online meeting was the first of the NEC since Keir Starmer became party leader - and the row over the document threatens to split the party he is trying to unify.
The document, written by allies of Jeremy Corbyn while he was still leader, claimed to have found no evidence" of anti-Semitism being handled differently from other complaints and that "factional opposition" towards Mr Corbyn hindered efforts to tackle the crisis.
It said there had been "a litany of mistakes, deficiencies, and missed opportunities" to tackle the issue, and "rigorous and far-reaching reforms" had not been made soon enough.
It also alleged that some now-ex party staff tried to undermine Mr Corbyn's leadership ahead of the 2017 election, and published excerpts from their WhatsApp messages criticising Mr Corbyn and his allies.
But critics say the report was leaked in an attempt to "smear whistleblowers" who had raised concerns about the party's handling of anti-Semitism.
Some staff named in the unredacted document, which was leaked online, are understood to be considering legal action against the party.
A spokesperson for the Labour Party said: “The National Executive Committee has today agreed the terms of reference for the independent investigation into the circumstances, contents and release of an internal report.
"The NEC will meet again in due course to agree the individuals who will be appointed to lead the investigation.”
