US diplomats warned Saturday that commercial airliners flying over the wider Persian Gulf faced a risk of being “misidentified” amid heightened tensions between the US and Iran, The Associated Press reported.

The warning relayed by US diplomatic posts from the Federal Aviation Administration underlined the risks the current tensions pose to a region crucial to global air travel. It also came as Lloyd’s of London warned of increasing risks to maritime shipping in the region.

Concerns about a possible conflict have flared since the White House ordered warships and bombers to the region to counter an alleged, unexplained threat from Iran.

President Donald Trump since has sought to soften his tone.