“The attack occurred at a camp in Gerille in Wajir on Wednesday night and we lost three officers, two others were injured,” a seniorpolice officer in the region, speaking on condition of anonymity, told AFP.
“There are others who have not been accounted for,” he said, adding that the attackers had used firearms and thrown an explosive device.
The strike took place some 100 kilometres (60 miles) from Kenya’s border with Somalia, an area hit by a series of blasts in the three months since Nairobi sent troops into Somalia to fight Islamist Shebab insurgents there.
Hand grenades have been thrown into bars and a church, while homemade explosive devices have been set off, many targeting security forces.
Police spokesman Eric Kiraithe confirmed the attack but said he had not yet “received the full details.”
No group claimed responsibility, but Kenyan officials have repeatedly blamed Somalia’s Al-Qaeda linked Shebab or their sympathisers for previous bombings and shootings, although armed bandits also operate in border areas.