Kenya’s Minister for Internal Security George Saitoti said Thursday three police officers are under investigation.The newspaper Daily Nation printed photos taken on a cell phone Wednesday. The photos show two men lying face down and an undercover police officer pointing a gun. A later photo shows two men dead. A third killing also apparently took place.Saitoti says it is not government policy to execute suspects. A 2009 UN report, though, found that police executions in Kenya are systematic and widespread.