( CNN ) -- Deadly explosions ripped through two passenger buses in Nairobi , Kenya 's capital , on Sunday , killing at least three people and injuring a number of others . Kenyan police reported three people were killed and seven injured in one bus explosion , but they have not yet confirmed the second blast . Police are treating the incident as a terrorist attack , but there were no immediate suspects , spokeswoman Zipporah Mboroki said Sunday . The Kenya National Disaster Operation Center confirmed explosions on two buses . The agency tweeted that two people were killed and 62 injured , including 20 , who were in critical condition . Kenya 's Interior Ministry reported that of the 20 people critically injured in the attacks , nine were women , six were men and five were children . The buses were on Thika Highway , one near the Safari Park Hotel , the other near the Homeland Inn , when the explosions occurred , according to a tweet from the NDOC . Pictures from the scene show the buses were still mostly intact , but the windows were blown out of both vehicles . One of the buses had a piece of its side missing and part of its front bumper . Kenyan police said they will have more information on the deadly attack at a news conference Monday . Tossed grenade in Mombasa kills at least three people . Four killed in blast in Nairobi suburb . New law legalizes polygamy ; women 's group applauds it . CNN 's Jo Shelley , Elwyn Lopez and Josh Levs contributed to this story .
Bus attacks in Kenya leave dead and injured in capital . Kenyan officials offer conflicting reports on number of dead and injured . Kenyan police say terrorists are behind the bus attacks . Police schedule news conference for Monday .