David Kimaiyo, the inspector general of Kenyan police, said two of the victims in the last 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.
"We will pursue the attackers to the end and enough officers are currently involved in the operation," he said.
Kimaiyo said he believed the attackers belong to Somalia's al-Shabab, which has staged many attacks inside Kenya in retaliation for the Kenyan government's decision in October 2011 to send troops into Somalia to battle them. The Kenyan government sent troops there after several cross-border attacks and kidnapping of foreign tourists that were blamed on al-Shabab.