The United States could resume a naval blockade against Iran in the Strait of Hormuz and possibly take over Iran's Kharg Island, US President Donald Trump said here Wednesday on the sidelines of the NATO summit.

Earlier, Trump told reporters in Ankara that the United States may hit Iran again "hard" on Wednesday night.

The remarks came as the United States and Iran traded fresh attacks from Tuesday night to Wednesday, marking a new round of escalation.

The United States has launched strikes against 80 Iranian targets allegedly in response to recent Iranian attacks on commercial vessels transiting the Strait of Hormuz. Later, Iran's Islamic Revolution Guard Corps attacked 85 U.S. military sites in Bahrain and Kuwait.