Suspected Somali militants on Thursday evening killed three Kenyans in the restive northern town of Garissa in the latest attack amid growing insecurity in the region.
Garissa County Commissioner Maalim Mohammed confirmed the incident which took place at around 8 p.m. (1700GMT) at Iftin location, about 4km from Garissa town.
"The deceased were having supper at an eatery joint at around 8 p.m. when a hand grenade was hurled at them," Mohamed told Xinhua by telephone.
He said the three whose identities have not been established died on the spot, adding that no arrest has been made in connection to the incident.
"There is a security operation underway to arrest the attackers, " Mohammed said.
The militants have continued to carry out attacks in Garissa despite heightened security around the country with security agencies at an unprecedented state of alert.
The insurgents who have signed joined Al-Qaida network have been responsible for a string of foreigners' abductions and grenade attacks that occurred in the past two years that led to the Kenyan troops' pursuit of the militia group into Somalia.
The militia group is very angry with Kenya for sending troops into Somalia to attack its compounds and kill its fighters, but Nairobi said its military action in Somalia is only for self defense.
The police have also called on Kenyans to be vigilant and report any suspicious individuals in their midst to security personnel.