NAIROBI, Kenya (AP) — Gunmen believed to be Somali militants killed six people in an overnight attack on police posts near Kenya’s border with Somalia, Kenya’s police chief said Sunday.

David Kimaiyo, the inspector general of Kenyan police, said two of the victims in the Saturday night attack were Kenyan police officers and that six more are missing. The al-Qaida-linked Somali militant group al-Shabab claimed responsibility in Twitter updates, saying it killed eight people in the cross-border attack and wounded more than a dozen. The militants also said they had seized two Kenyans in the attack as well as weapons and boxes of ammunition.