US state secretary Marco Rubio has warned Iran against closing the Strait of Hormuz, a key shipping route, after Iranian lawmakers backed such a move, which would likely disrupt global oil exports, reported the German news agency dpa.

"If they do that, it will be another terrible mistake," Rubio said on Sunday, less than 24 hours after the US launched airstrikes on key Iranian nuclear sites in what marked a major escalation in the war between Israel and Iran.