Mombasa County Commissioner Nelson Marwa has blamed the Orange Democratic Movement (ODM) for the recent killings in Likoni.
Speaking during the county security committee meeting Friday, Mr Marwa said authorities had evidence to back their claims.
The claims follow a series of attacks in Likoni by hooded gunmen that have left at least six people dead.
A week ago, four people were shot dead in the Soweto slum in Likoni.
In another attack, gunmen shot dead two people at Sega bar and wounded two others.
Police launched a major security operation in the area involving soldiers of the Kenya Defence Forces. A grenade was recovered during the operation.