Israel and Iran launched fresh attacks on each other overnight into Sunday, as U.S. President Donald Trump said the conflict could be easily ended while warning Tehran not to strike any U.S. targets.

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.

The strikes came after the Israeli military said it had carried out fresh strikes on Iran nuclear infrastructure sites.