Dereck Chisora has been arrested by German police after a brawl with fellow British boxer, David Haye, in Munich, Germany.
Chisora and his trainer, Don Charles, were taken from the city’s airport by police as part of the investigation.
Haye and Chisora clashed at the post-fight press conference after Chisora was beaten on points by defending World Boxing Council champion, Vitali Klitschko.
Police are still searching for Haye, who was not present at the hotel when sought for questioning.
Haye showed up at the news conference to confront Klitschko, whom he believes changed his mind on a potential fight between the pair.
David Haye lost to Wladimir Klitschko last July but is hoping to face brother Vitali this summer
However, that sparked a verbal exchange with Chisora and the pair squared up to each other before a brawl ensued.
Chisora accused Haye of “glassing him”, before saying at least four times that he would shoot the former WBA heavyweight champion.
He added: “If David don’t fight me, I am going to physically burn him.”
Chisora arrived at the airport to return home, but was stopped by police, who have detained him at their Munich headquarters.
A Munich Criminal Police spokesman said: “Police picked up Mr Chisora at the airport at approximately 10.30am [German time] and are bringing him in for the investigation.
“They also picked up Mr Chisora’s trainer for questioning. The police went to the hotel to speak to them but we had been informed they had just checked out.
“We are currently looking for him. He was not at the hotel this morning and we have not seen him at the airport.”
Chisora has had part of his fight purse withheld by the World Boxing Council after he slapped Klitschko at the pre-fight weigh-in on Friday.