Pittsburgh major crimes investigators are searching for clues in two serious but unrelated incidents overnight.

A man was critically wounded in a stabbing around 1 a.m. at a crowded night club in Station Square.

And a cab driver was hospitalized less than an hour later after an attempted robbery in Knoxville.

The stabbing occurred during a violent confrontation at Matrix.

A man, 23, of Munhall, was stabbed in the neck with a broken bottle, police said.

The victim was in critical condition at an undisclosed hospital.

About 700 people had been inside the club at the time, police said.

No arrests had been made today, police said.

Around 1:35 a.m., a Yellow Cab driver called his dispatch office to report that a man had tried to rob him at gunpoint.

A woman who had been a fare in the cab said the driver had just dropped her off in the 400 block of Moore Avenue. As she walked toward her destination, the woman said she heard a gun shot and saw the cab's driver side door ajar.

The driver, a 30-year-old man, suffered what appeared to be gun shot wounds of the chest and stomach.

He is hospitalized in critical but stable condition, police said.

The female witness described the suspect as a light skinned black male who was last seen fleeing from the scene.

No arrests have been made.

Anyone with information about the robbery is asked to contact the police robbery squad at 412-323-7151.