Somalia’s Islamic extremist rebels, al-Shabab, have claimed responsibility for an attack on a bus in Kenya in which 28 non-Muslims were singled out and killed.

At least 12 civilians have been killed in a suicide attack targeting African Union troops in Somalia’s Lower Shabelle region, the first serious assault by suspected Islamic extremists after the killing of al-Shabab’s top leader in a US air strike last week.

Mortar shells have struck a Mogadishu neighbourhood a day after al Qaida-linked militants named a new leader.

FBI experts have begun fingerprint, DNA and forensic analysis to help identify victims and the gunmen who attacked a Kenya shopping centre, killing more than 60 people.