The Kenyan military says it has launched air strikes against Islamic militants in Somalia following an extremist attack on a college that killed 148 people.

Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn yesterday, killing 147 people in the group’s deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk.

Islamic militants have blasted their way into a Somali hotel and taken positions inside, exchanging fire with security forces seeking to regain control of the building, a police official said.

A video claiming to be by Somalia’s al-Qaida-linked rebels has urged Muslims to attack London shopping sites including Oxford Street and Westfield Stratford City.

At least 10 people were killed when Islamic extremists targeted a hotel where Somali government officials were meeting.