Local media said another attacker had been seized by police. However, there were conflicting reports on the attackers.
Several men tossed grenades and fired on a crowd at a bus stop in Place Saint Lambert, a busy square, the BBC reports. Witnesses reported four explosions and gunfire.
The police rushed to the scene and sealed off the square. Television images showed blood splattered across the cobblestones, the Guardian reported.
More details awaited