Kate Whannel
Political reporter
Iain Watson
Political correspondent
PA Media
Jeremy Corbyn has said "discussions are ongoing" after ex-Labour MP Zarah Sultana announced she was quitting the party to co-lead a new left-wing party with him.
The ex-Labour leader congratulated Sultana on her "principled decision" to leave and said he was "delighted that she will help us build a real alternative".
He said "the democratic foundations of a new kind of political party will soon take shape" but stopped short of providing details as to who would lead it.
Talks have been going on under the radar for some time to turn the small group of independent pro-Gaza MPs, co-ordinated by Corbyn, into an actual political party which could stand candidates at next year's local elections.
But the BBC has been told the question of leadership and the exact timing of the announcement had not been settled when Sultana made her declaration on Thursday evening.
Some of those behind the project wanted a democratic conference to decide the leadership question.