GARISSA , Kenya — An official said gunmen suspected of belonging to Somalia’s al-Qaida-linked rebels shot dead five people and seriously wounded three others at a restaurant in eastern Kenya.

The region’s police chief said Wednesday that supporters of Somalia’s al-Shabab rebels are suspected because the dead include a senior prison warden, fitting into a pattern of prior attacks on security personnel.

The attack took place at the Dune restaurant in Garissa.

In October, gunmen shot dead a police officer and wounded another in Garissa.

In November, three Kenyan soldiers and two police officers were shot dead in the town.

Kenya has had a series of explosive attacks since it sent troops to Somalia to fight the al-Shabab rebels.