In Iran’s capital city, the streets are empty, businesses closed, communications patchy at best. 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.

The Israeli military said it was conducting strikes in the Tehran area early Wednesday local time. The announcement came shortly after it warned residents of a Tehran district to evacuate, saying that it would be striking at military infrastructure in coming hours.