Three people were killed and at least 60 wounded when two homemade bombs exploded on buses along one of the busiest highways in the Kenyan capital, Nairobi, authorities said Sunday, as this East African nation struggles to stop a series of terrorist attacks.

Of the 60 wounded, 20 were in critical condition, according to the National Disaster Operations Center.

Sunday’s blasts were on two buses packed with commuters along Thika Highway, said Moses Ombati, the deputy police chief in Nairobi. Eliud Lagat, the deputy head of the bomb disposal unit said the blasts were caused by improvised explosive devices.

The explosions come a day after two blasts at the Kenyan coast killed four people. Police said a grenade thrown at a bus stop in the coastal town of Mombasa killed the four. The second blast at a public beach did not cause any fatalities, police said.

Kenyan President Uhuru Kenyatta reacting to the blasts at the coast said Sunday that terrorists want to provoke a sectarian war.

“The terrorists would like a war of religion, bringing to an end our history of tolerance. This country will not allow it. The terrorists will be treated as the vicious criminals they are, and our tradition of easy coexistence will be maintained,” Kenyatta said.