Two people, including a police officer, have been killed in a shooting near a nightclub in the northeastern US city of Baltimore.

Authorities say a 33-year-old police officer and another man died in the shooting in the state of Maryland early on Sunday.

Reports of a fight at the club brought officers to the scene, where six people were shot during an eruption of gunfire.

Anthony Guglielmi, a police spokesman, declined to immediately identify the victims by name.

A second officer suffered a shot to one leg and three women were also injured. There were no reports on their conditions.

Guglielmi said officers were called to a club in Baltimore's business district after a report of a large fight and summoned additional officers. Some officers fired weapons and investigators are trying to determine whether there was any civilian gunfire.

"It was a pretty significant fight from what we understand. A large fight and a number of officers responded,'' Guglielmi told the Associated Press news agency. It ultimately spilled outside into the parking lot.''

No arrests have been made but dozens of people are being questioned.

Source: Agencies