ISIS seized two gas fields Monday northeast of Syria’s ancient Palmyra, a day after firing rockets into the city and killing five people, activists said.

The Al-Hail and Arak gas fields, 40 and 25 kilometers (25 and 15 miles) respectively from Palmyra, were vital for the government’s generation of electricity for areas under its control, the Syrian Observatory for Human Rights said.

Fierce clashes have rocked Palmyra’s outskirts since ISIS launched an offensive on May 13 to capture the 2,000-year-old world heritage site nicknamed “the pearl of the desert”. […]