Militant Islamist group al-Shabab says it was behind the attack which killed at least six people and wounded one in north-eastern Kenya.

The militants threw a grenade before opening fire in a residential area in Mandera town, police said.

Mandera County governor Ali Roba confirmed the casualties, adding that security guards had saved 27 people.

Al-Shabab is headquartered in Somalia, and has carried out a string of attacks in neighbouring Kenya.