There will be a rebellion within Labour if party leaders try to whip a vote on the issue of Syria, a shadow minister has admitted.
MP Emily Thornberry said there was "brutally honest" debate among MPs at the moment, as they ask their constituents what they believe should happen.
It comes after leader Jeremy Corbyn sparked a furious backlash after revealing he could not back RAF air strikes against so-called Islamic State in Syria, before the shadow cabinet had reached an agreed position on the issue.
Speaking to BBC Radio 4's Today programme, Ms Thornberry said:
We have an open debate, and a brutally honest debate, going on within the Labour Party.
I think there will always be divisions within the political parties, the Conservatives will have their divisions too.
When it comes to an issue of war it is something that people think very profoundly about. We do usually act collectively, but I think on issues like this there are times when people cannot stick to a whip which is imposed.
Protesters gathered outside Downing Street to urge MPs to vote down plans to bomb the war-torn country
Divisions within Labour appeared to grow over the question of airstrikes on Syria, as shadow chancellor John McDonnell backed a free vote.
A Labour source reveals the (un)pleasantries at the shadow front bench meeting, including a confrontation between two high-profile members.