Al-Qaeda and the Islamic State group have stepped up attacks in Aden.

At least 16 people, including four Indian nurses, were killed when gunmen opened fire Friday at an elderly care home in Yemen’s main southern city of Aden, security officials said.

Four gunmen stormed the care home in Aden’s Sheikh Othman district, killing a guard and shooting randomly at residents, the officials told AFP.

Dozens of stricken family members arrived at the site following the attack, witnesses said.

One official said the attackers were “extremists” and blamed the ISIS, which has been gaining ground in Aden in recent months.

But no group claimed responsibility for the attack, the first of its kind in Yemen, where the internationally-recognized government is grappling with an Iran-backed rebellion on one side and a growing jihadist presence on the other.

President Abedrabbo Mansour Hadi has declared Aden Yemen’s temporary capital as Sanaa remains in the hands of the Houthi rebels and their allies since they seized it in September 2014.

Al-Qaeda and IS have stepped up attacks in Aden despite the efforts of the government and its backers in a Saudi-led coalition battling the Houthis and their allies to secure it.

However, most of the extremists attacks have targeted coalition forces and pro-government Yemeni troops.

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