World Bulletin / News Desk 

At least 13 Kenyan policemen remain missing after Al-Shabaab members late Monday ambushed a police convoy while on patrol in northeastern Kenya's Garissa County.

"Thirteen officers have not been accounted for," Kenyan police spokesman George Kinoti told on Tuesday morning.

"There was an ambush and our men took cover," he said. "At the moment, we are waiting for the officers to resurface."

Police say around 20 gunmen associated with Somalia's Al-Shabaab armed group attacked a convoy of eight Kenyan police vehicles while they were on patrol in Garissa's County's Fafi and Yumbis areas.

"We sent the contingent of officers for reinforcement to the area after an earlier attack by the militants," Kinoti said.

"The militants burnt five Kenyan police vehicles; two officers were critically injured and have been flown to Nairobi for treatment," he added.

"Three other officers sustained minor injuries," the police spokesman said.

Kenyans on social media, meanwhile, shared unconfirmed reports that as many as 20 police officers had been killed.

"I am urging Kenyans to desist from posting any information on social media without verification," Kinoti said. "If there is a death toll, then the Kenya police will update."

The police spokesman said top security chiefs were currently meeting in Nairobi.

On Monday, the Kenya Defense Forces killed seven Al-Shabaab militants in Somalia.