Two men threw explosives in the centre of the Belgian city of Liege, killing two people including one of the attackers and wounding about 15 people, Belgian news agency Belga reported on Tuesday.
The men threw multiple explosives towards a bus stop at Place Saint Lambert, in the centre of the city, which is about 90 km (55 miles) east of Brussels.
Police and justice officials either declined to comment or were not immediately available.
Local bus operator TEC said that its buses were no longer able to enter the city centre. A museum located on the square said it had taken in injured people.
As we are very close and we have an open space where you can enter and leave with no problem. I can say there were injured, but don't ask me if it's five, seven, eight or nine. I don't know, said Archeoforum director Jean-Jacques Messiaen.
(Reporting By Robert-Jan Bartunek, Ben Deighton, Philip Blenkinsop; editing by Rex Merrifield)