U.S. President Donald Trump on Thursday told journalists they would “soon find out” whether his country would strike Iran.

President Trump’s remarks came after Washington on Thursday confirmed that one of its drones had been brought downed in international airspace over the Strait of Hormuz by an Iranian surface-to-air missile.

Iranian authorities said the drone was shot down after it entered Iranian airspace.

“The downing of the American drone was a clear message to America. ... Our borders are Iran’s red line and we will react strongly against any aggression,” Major Gen. Hossein Salami, the recently appointed chief of Iran’s elite Islamic Revolutionary Guard Corps, told Iranian state TV. “Iran is not seeking war with any country, but we are fully prepared to defend Iran.”

Trump had earlier said via his personal Twitter account that “Iran made a very big mistake!”

The shooting down of the U.S. drone marked the first direct Iranian-claimed attack on U.S. assets amid an escalating crisis between the two countries. The two countries have been at loggerheads since mid-May.

The U.S. military's Central Command called the incident an "unprovoked attack on a U.S. surveillance asset in international airspace.”