"Lost" star Matthew Fox was detained by police in Cleveland on Saturday night after he allegedly punched a woman in the breast and "stomach area," TMZ reported Monday, citing sources.

Fox allegedly tried to board a party bus without an invite when the woman tried blocking his path, leading to the altercation, according to the report.

The woman struck back at Fox, hitting him "in the mouth ... causing a cut on his lip," according to a police report seen by the entertainment website.

The actor was later detained by cops and released without a formal arrest being made. However, the matter was still under police investigation, the website reported.

Fox was unable to be reached for comment, TMZ added.