mombasa kenya suspect militants somali group al shabaab behead four men two different attack lamu county kenya north coast wednesday authorities say month 12 people kill similar incidents region lamu county commissioner gilbert kitiyo say attack take place silini-mashambani early wednesday three kill separate incident bobo village one person kill kitiyo say 30 heavily-armed assailants go house-to-house call victims name pull slit throats dress military gear ak-47 rifle behead four men flee forest victims men police already arrive scene take body mortuary kitiyo tell reuters telephone say attackers surround victims house make difficult escape abdiasis abu musab al shabaab spokesman military operations say group behind attack put number kill five say target non-muslims august al shabaab attackers kill four men similar manner early july nine men slaughter way nearby villages late attack protesters burn tyres roads wednesday morning complaint insecurity riot police fire teargas rubber bullets disperse government-imposed dusk-to-dawn curfew force area follow past attack al qaeda-linked al shabaab aim topple somalia unite nations-backed government impose strict interpretation islam intensify attack kenya since send troop somalia 2011. also claim responsibility series cross-border attack recent months include spate roadside bomb target security force suspect al shabaab militants behead four kenya 's lamu county official