NEW YORK -- Police are investigating the mysterious death of a man found bleeding from the mouth as he staggered out of a Manhattan nightclub early Saturday.

Waitresses taking a 3:00am local time cigarette break outside District 36, a Midtown nightclub, initially believed the man was drunk, sources said.

Then the women noticed the clubgoer was bleeding profusely from his mouth.

The waitresses contacted security guards, who saw the man's teeth had been knocked out. Paramedics rushed the man to Bellevue Hospital, where he was declared dead about 4:30am, police said.

His name has not been released.

Detectives were on the scene at District 36 Saturday morning trying to determine if the man was assaulted there.

No arrests have been made.

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