Death toll from the major security operation which was conducted in Kenya’s coastal city of Mombasa has risen to three after a policeman succumbed to injuries in a grenade attack.Regional police commander Aggrey Adoli told a news conference in Mombasa on Wednesday that two terror suspects had earlier been killed in the dawn security crackdown on suspected Al-Shabaab militants in the coastal city.He said eight policemen who were injured in the grenade attacks during the 3 a.m. raid in Likoni area, are still nursing injuries in the hospital."The police officers had arrested a terror suspect at Changamwe who had led police to the house where they were attacked. During the raid a suspect who was in the house hauled grenades to our officers and opened fire, seriously injuring nine,” Adoli said.He said two Al-Shabaab terror suspects were also killed during the operation by the grenade. The officers were rushed to hospital and are receiving treatment."Four of the police officers are in critical condition. Police recovered a pistol, an AK47 rifle, two grenades from the house,” the regional police commander said.Sources said the suspect is said to have declined orders to open the door forcing the police to use extra force to get access to the house.The suspect is then said to have hurled a grenade at the police officers, killing his accomplice on the spot and injuring 10 police officers on the spot.Adoli noted that a combined team of officers are still combing the area with reports that more arms could be hidden in the house."We heard gunshots at around 3.00 a.m. and loud explosion, an indication that the officers were battling with militia,” eye witnesses Mwagomba Juma said.Coastal town of Mombasa has in the past experienced terror attacks carried out by members of Al-Shabaab group.