KIGALI (Reuters) - Three grenade attacks hit the Rwandan capital Kigali on Friday night, killing one person and wounding 18, police said on Saturday.
The police said it was not yet clear who was behind the attacks nor whether they were coordinated.
"There was one death and 18 injuries," police spokesman Eric Kayiranga said.
Two grenades exploded in the two centre and a third went off at the international bus staion, all within half an hour.
Many grenades were left over from lengthy conflicts in the Great Lakes region and are sometimes used to settle scores.
At a university hospital on Friday night, relatives told Reuters four of the wounded men were in a critical state. One man had shrapnel wounds to his ear and nose. A dead man lay in a pool of blood on the hospital floor.
"There is a possibility of it being FDLR (Democratic Forces for the Liberation of Rwanda), or criminals, or an accident. It can be any of that. We can't confirm that for now," Kayiranga said.
The FDLR is a ethnic-Hutu rebel group based in eastern Democratic Republic of Congo. It includes people responsible for carrying out the 1994 genocide of Tutsis and moderate Hutus.
While there has generally been little crime in recent years in the central African country -- where 800,000 were killed in the genocide in 100 days -- there are occasional bombings.
A string of grenade attacks have killed four people in the last two months, including witnesses in a genocide court case.
Last year Rwanda destroyed 30,248 small arms and 70 tonnes of ordinance, including 1,332 hand grenades, according to the Web site of the Mines Advisory Group, an international demining organisation.