Polish Prime Minister Donald Tusk on Thursday urged all Polish citizens to leave Iran “immediately,” warning that a potential military conflict could make evacuations impossible within hours.

“Please leave Iran immediately and do not travel to this country under any circumstances,” Tusk said.

His remarks came as U.S. media reported that the military had informed the White House of its readiness to carry out potential strikes on Iran as early as the end of the week, amid escalating regional tensions.

Reports said President Donald Trump had discussed options both for and against military action in private meetings and continued to consult advisers and allies on the best course of action.

There was no immediate comment from the White House or the Pentagon, and Iran did not immediately respond to the developments.