UPDATE: 10:39 a.m. IST Feb. 5 -- The External Affairs Ministry has clarified that only one Indian nurse was killed by gunmen in Yemen. 

"Of the four nurses killed in Yemen, only one is Indian named Cecilia Minz," External Affairs Ministry Ministry Spokesperson Vikas Swarup said, according to NDTV

External Affairs Minister Sushma Swaraj had tweeted Friday four Indian nurses were killed in the terrorist attack. 

Original story:

At least 16 people were reportedly killed when gunmen Friday attacked a home for elderly people in the Yemeni city of Aden. The attack at the retirement home in Aden's Sheikh Othman district was carried out by four unidentified gunmen.

A guard was also among the deceased, Agence-France Presse quoted officials as saying.

The deceased include 12 residents of the care home and four Indian nurses who worked there, Middle East Eye cited Sky News Arabia as saying.

Another Indian nurse reportedly survived the attack, as she hid in a medical storage room when the attackers entered the care home and opened fire.

The gunmen shot at the nurses after separating them from the residents of the care home, officials told the Associated Press on condition of anonymity. After shooting at the nurses, they handcuffed the residents and shot them dead, they added.

No group has claimed responsibility for the attack yet. However, one official told AFP the gunmen were "extremists," blaming the Islamic State group for the attack.