AFP reports that 16 people were killed on Friday when gunmen opened fire at an elderly care facility in the Yemeni port city of Aden.
Four gunmen entered the facility, killed the guard, and then tied up and executed the employees, according to AFP. Four of the slain were Indian nuns attending to the patients as nurses.
Yemeni officials are saying the attack was conducted by Daesh, which has shown an increased presence in Aden in recent months. However, neither Daesh nor any other militant group has claimed responsibility for the attack.
Aden is functioning as Yemen's temporary capital, as Houthi rebels have controlled Sanaa since September 2014.
While there is an ongoing conflict in Yemen between embattled President Abd Rabbo Mansour Hadi and the Houthi rebels, direct on-ground attacks on civilians is very rare. However, Saudi-backed airstrikes have hit civilian targets in Sanaa and Taiz on multiple occasions.