At least one grenade exploded at a downtown Beirut square early Sunday, wounding four people, police said.
The grenade was fired from a rifle toward Riad Solh Square in central Beirut and hit a building, the police said.
The explosion broke some windows in the building and damaged two cars, witnesses said. Police and army troops ringed the area and an investigation was under way. The four wounded, who are all believed to civilians, were taken to a hospital for treatment.
Two were released from hospital shortly afterward, but a couple remained for treatment, hospital staff said. Among them were two who were waiting on a sidewalk for the valet to pick up their car.