A Rwandan police spokesman says 16 people have been wounded in the second wave of grenade attacks to hit the capital in two weeks.

Police spokesman Eric Kayiranga said Friday that two people were critically wounded in the blasts late Thursday. Eyewitness Karim Habimana said he saw someone hurl a grenade from a speeding car next to a bus stop in the suburb of Kimironko.

Kayiranga could not say if the recent attacks were related to three Feb. 19 grenade attacks, also in Kigali. Those attacks killed one person and injured 30.

Rwandan authorities charged a Rwandan general with committing the earlier attacks. On Friday, South African authorities said he was in South Africa but could not be arrested because there is no extradition treaty with Rwanda.