NEW YORK (AP) — The streets of Tehran are empty, businesses closed, communications patchy at best. With no bona fide bomb shelters open to the public, panicked masses spend restless nights on the floors of metro stations as strikes boom overhead.

Thousands of people were fleeing Tehran on Wednesday after Israeli warplanes bombed the city overnight, and a source said U.S. President Donald Trump was considering options that include joining Israel in attacking Iranian nuclear sites.

Explosions were heard in Tehran early Wednesday as Israeli warplanes pounded Iran’s capital overnight and into Wednesday. Iran’s supreme leader on Wednesday rejected U.S. calls for surrender and warned that any military involvement by the Americans would cause “irreparable damage” to them.