Somali Prime Minister Abdiweli Mohamed Ali has condemned the shooting deaths of two foreign aid workers in the Somali capital, Mogadishu.

The two worked for the local office of Doctors Without Borders.

Mr. Ali said the attack Thursday was a tragic example of an isolated incident, and does not reflect any increased risk to international aid workers. He said the person responsible would be brought to justice.

Witnesses identified the gunman as a former Doctors Without Borders employee who was fired on Wednesday.

“The gunman was fired from his job yesterday; he came to the compound today and managed to sneak through the patients, and kill the doctors. We were all scared when we heard the sound of the gunshots.”

Doctors Without Borders said the victims were an emergency coordinator from Belgium and an Indonesian doctor. Both were working to provide emergency medical aid to displaced persons in war-torn Mogadishu.

The gunman was arrested after the attack.

Doctors Without Borders said following the shooting it plans to move some of its staff out of Somalia for security reasons.

Mogadishu is one of the world's most dangerous places for foreign workers.

The attack comes less than a week after three aid workers with the World Food Program were shot and killed in the central Hiran region of Somalia.

The impoverished Horn of Africa nation has not had a stable government since a 1991 coup. The Militant Islamist group al-Shabab is fighting to take control of Mogadishu and impose strict Sharia law in the country.