Israel’s latest wave of attacks on Iran took out Tehran’s main gas depot and its central oil refinery in separate parts of the capital, engulfing its sky in smoke and flame early Sunday.

The Shahran fuel and gasoline depot, which has at least 11 storage tanks, was hit and set afire during the Israeli attack that began on Saturday night, Iran’s oil ministry said in a statement. Shahran is in an affluent neighborhood of luxury high rises.

“The fire is terrifying, it’s massive; there is a lot of commotion here,” said Mostafa Shams, a resident of the area. “It’s the gasoline depots that are exploding one after another, it’s loud and scary.”

Separately in the city’s south, Shahr Rey, one of the country’s largest oil refineries, was also struck, according to Iranian state news media. Emergency crews were trying to contain the fire, and a resident of Tehran, Reza Salehi, said he could see the flames from miles away.

Israel’s targeting of Iran’s energy facilities, a crucial source of export cash for the country as well as of domestic energy, represented a significant escalation in its military campaign against Tehran.

Earlier on Saturday, Israel had struck two key Iranian energy sites, including a section of the South Pars Gas Field, which is one of the world’s largest and critical to Iran’s energy production.