One person was shot dead in Mtongwe, Mombasa on Monday amid allegations the operation was executed by the police.
Maitha Omar, 21, was shot in the head and shoulder at his home. He died instantly.
Area MCA Musa Mwidani said the shooters raided Maitha's home as he was taking tea and pumped bullets that left him dead.
"After the shooting, the attackers ran away," Mwidani said.
Muslims for Human Rights rapid response officer Francis Auma accused the police of killing the suspect outside the law.
He said the fact that Omar was unarmed and shot at close range showed that the officers had an opportunity to arrest Maitha but ignored.
"We have been saying police are trigger-happy by they have denied. This is one case that backs our stand," he said.
It remains unclear whether the police were involved in the execution.
When contacted, Mombasa police commander Johnstone Ipara said he was waiting for details before commenting.
Omar's body was taken to the Coast Provincial General Hospital morgue by local leaders and the rights group.
