Angela Rayner has been sacked from her role as chair of the Labour party after the disastrous local election results in England.
The Mirror understands the MP has been removed from her roles as chair and campaign co-ordinators by party leader Keir Starmer.
It appears to be the first move in a brutal reshuffle by Sir Keir, who said barely 24 hours ago that he would take responsibility for the results.
It is likely to spark a wave of recriminations among party members. Ms Rayner was a stalwart of the Corbyn era but also had broad support from Labour's base - winning double the votes of her nearest rival.
Despite Sir Keir's decision Ms Rayner remains as deputy leader, as that role is elected by party members - meaning she will still wield considerable influence on the party.
With 124 out of 143 councils declared in England tonight, Labour had lost 228 seats - despite losing seats the last time many of the same areas were up for election in 2017.
The move was condemned by the pro-Jeremy Corbyn group Momentum. Co-chair Gaya Sriskanthan said: "Angela Rayner's sacking is blatant scapegoating.
"Channel 4’s polling shows that the main reason for the catastrophic defeat in Hartlepool is Keir's leadership.
"It is his failed strategy that has brought us to this point, and he said he would take responsibility.
"Yet again he has gone back on his word."
The shock decision comes after heavy speculation that Sir Keir would kick-start a reshuffle following the grim election news.
Those under threat are said to include Shadow Chancellor Anneliese Dodds, Shadow Housing Secretary Thangham Debbonaire and Shadow Commons Leader Valerie Vaz.
Shadow Education Secretary Kate Green is also thought to be in the crosshairs, while former Shadow Home Secretary Yvette Cooper and ex-Foreign Secretary Hilary Benn are big beasts tipped for a return to the frontline.
But critics of Sir Keir have accused him of deflecting from the wider problems that led to Labour's defeat.
And the shake-up comes despite Labour's leader saying yesterday: "I take full responsibility for the results - and I will take full responsibility for fixing this."
This breaking news story is being updated.