The United Nations mission in Somalia on Sunday condemned bombing attacks in Mogadishu and in northeastern Kenya that killed at least 21 people and injured more than 20 others on Saturday.

No political agenda can be served by acts of terrorism, the UN Assistance Mission in Somalia said after the attacks, both claimed by al-Shabab terror group.

Nine people died in two car bomb blasts in Somalia, and 12 Kenyan policemen were killed when a vehicle they were traveling in ran over an improvised explosive device (IED) in Wajir County, along the Kenya-Somalia border.

"UN Somalia strongly condemns yesterday's attacks in Mogadishu and northeastern Kenya by al-Shabab," it said in a tweet on Sunday.

Somali police commander Bashir Abdi Mohamed said on Saturday that nine people were killed and 25 others injured in the first car bomb attack at Sayidka junction.

The second car bomb exploded near KM4 junction and resulted in the death of the bomber, Mohamed said, adding that security forces arrested an accomplice, who was injured.

In the northeastern Kenya IED attack, one police officer sustained serious injuries.

The police officers were on patrol between Khorof-harar and Konton in Wajir county when their vehicle ran over the IED, Police Inspector General Hilary Mutyambai said.

Both Mogadishu and Wajir attacks were claimed by al-Shabab, who on Thursday abducted three Kenyan police reservists from the same area in Wajir region.

Xinhua