MANDERA, Kenya - Unknown gunmen stormed a police station on Thursday, killing two Administration Policemen (AP) officers and injuring three others in northern Kenyan town of Mandera.

Regional police commander, Charlton Mureithi confirmed the incident which took place at 3 am Thursday that also left over 10 vehicles extensively damaged after being burnt.

Witnesses said the gunmen who hurled a rocket propelled grenade at the local administrator officer's office before burning it, and they spent a lot of time in the police station before escaping.

"No arrest has been made but we hope to catch up with them. They caused huge destruction," Mureithi said by telephone.

He said they have launched investigations to establish the motive of the attackers who also threw the explosive device on a house at the police station and then escaped.

The attack came hours after a civilian was killed and four others injured in Wajir town on Wednesday evening after unknown gunmen hurled two grenades at a crowd but one exploded.

The two attacks occurred as Al-Qaida allied Al-Shabaab militants stormed a shopping mall in Nairobi on Saturday and killed over 61 civilians and six security officers.

Investigation is still underway to establish the identities of the terrorists behind the Westgate attack. It is not clear whether the two attacks in Mandera and Wajir towns were related to the bloodbath in Nairobi.