One soldier was killed and at least six others injured in Somalia on Sunday when a suicide bomber blew himself up at a military base in the west of the capital Mogadishu, a soldier and a hospital worker told Reuters.

The suicide bomber had disguised himself as a regular soldier and joined others as they filed into a military base early Sunday before he detonated the explosive, Captain AdenOmar, a soldier at the base told Reuters.

“We lost one soldier and several others were injured. The bomber blew up himself at a checkpoint,” he said.

Motive unclear

A nurse at Madina Hospital in Mogadishu told Reuters they had received one dead soldier and six others who were wounded.

It was not immediately clear who had carried out the attack but militant group al Shabaab frequently carries out bombings and gun attacks in Somalia and elsewhere.

The al-Qaeda-allied group wants to topple Somalia’s central government and establish its own rule based on its own strict interpretation of Islamic sharia law.