MILWAUKEE (AP) _ A gunman opened fire in the city's main post office early Friday, striking a worker in the head and wounding two other people before he shot himself. It was not immediately clear whether he was dead.

Two bodies were taken out of the post office and loaded into hearses about 3:40 a.m., nearly three hours after the shootings.

The gunman, described as an employee, opened fire in a third-floor mail sorting room and a witness told WTMJ-TV she counted 12 shots.

About 1,500 employees who were in the building a few blocks south of downtown fled as the shots were fired, witnesses said.

About three city blocks around the post office were cordoned off with yellow police tape.

``We're investigating the shooting at the post office right now. Several people have been shot. That's all I can tell you,'' said police Capt. Leslie Barber.

Postal employees leaving the building refused to comment, as did Postal Service officials.

An injured man and woman were in stable condition at Froedtert Memorial Lutheran Hospital, said spokesman Mark McLaughlin. Their injuries did not appear to be life-threatening, he said.