Three people have been killed and at least 60 wounded in twin bus bombings on a busy highway in the Kenyan capital, Nairobi.
The National Disaster Operations Center said of those wounded Sunday, at least 20 are in critical condition.
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,
There was no immediate claim of responsibility for the attacks.
Kenya has been hit by a wave of gun and explosives attacks since it sent troops to neighboring Somalia to fight the Islamist extremist group al-Shabab in 2011. The al-Qaida-linked militants have vowed to carry out terrorist attacks in Kenya to avenge the presence of Kenyan troops in Somalia.
Al-Shabab claimed responsibility for the attack on Westgate Mall that killed at least 67 people in September.