Ukip MEP Steven Woolfe was punched in the face, new medical evidence suggests.
Sources told ITV News that "bruises consistent with a punch" were found by a team of independent experts.
Mr Woolfe was involved in an altercation with fellow Ukip MEP Mike Hookem in Strasbourg on Thursday.
Mr Hookem "absolutely" denies being responsible for Mr Woolfe's injuries and claims he acted in self-defence during a "scuffle".
Mike Hookem denied any punches were thrown when he and Ukip leadership favourite Steven Woolfe clashed at the European Parliament.
Defence spokesman Mr Hookem admitted that a "scuffle" had taken place but maintained he acted in self-defence.
Mr Woolfe is currently in hospital in Strasbourg following the coming together.
But Mr Hookem insisted he was not responsible for his colleague's injuries.
"If they suspend me they will have to suspend Steven Woolfe as well", the 62-year-old told the BBC.
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?