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Quote :: "Lost" Star Matthew Fox Accused of Assaulting Woman

Matthew Fox
was detained by cops in Cleveland, Ohio Saturday night after allegedly
assaulting a woman outside of a bar ... TMZ has learned.

Law enforcement sources at the scene tell us ... the "Lost" star allegedly tried to enter a party bus -- even though he wasn't a guest on the vehicle.

We're told the woman who was driving the bus tried to block Fox from getting on board -- at which point, he allegedly punched her in the breast and the "stomach area."

Fox was handcuffed by an off-duty officer -- and was later detained by police.

Fox was released without being formally arrested.

An assault report was taken and the matter remains under investigation.

We have not been able to reach Fox for comment.

UPDATE: According to the police report, obtained by TMZ, the woman PUNCHED BACK -- and
struck Fox "in the mouth ... causing a cut on his lip."

The woman told police she may have broken her hand during the altercation.

Fox was later released to a friend ... who put the actor into a taxi and accompanied him back to his hotel.