Ukip's Steven Woolfe is in a "life-threatening" condition following an altercation with fellow party MEPs in Strasbourg.
Mr Woolfe, who turned 49 today, was taken ill after walking out on a vote at the European Parliament.
Woolfe, who declared on Wednesday his intention to run as party leader, was reported by Nigel Farage to be in a "serious" condition upon being taken to hospital.
Fellow leadership contender Raheem Kassem tweeted that he believed Woolfe was in a "life-threatening" condition.
I've just heard Steven Woolfe's condition is life threatening. Please keep him in your thoughts and prayers.
Sources told ITV News that "bruises consistent with a punch" were found by a team of independent experts.
Mike Hookem insisted he acted in self-defence during a "scuffle" with Ukip leadership favourite Steven Woolfe.
As Ukip and the European Parliament investigate the 'altercation' between Steven Woolfe and Mike Hookem, what could the repercussions be?