The Federal Aviation Administration on Thursday evening issued an emergency order that bars U.S. aircraft from an overwater area of Iranian airspace amid increased U.S./Iran tensions, according to Reuters.

The order covers a Tehran-controlled section over the Strait of Hormuz and Gulf of Oman. The agency also issued a separate advisory to operators that said the nearest civil aircraft was within approximately 45 nautical miles of the drone Iran shot down this week.

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"There were numerous civil aviation aircraft operating in the area at the time of the intercept," the FAA said, according to Reuters. The agency added that it is concerned about military activity in close proximity to civil aircraft routes.

Iran has said the drone, which it shot down with a surface-to-air missile, was within Iranian airspace.

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Thursday suggested he believed the downing of the drone was accidental.

“I have a feeling that it was a mistake made by somebody who shouldn't have been doing something that they did,” Trump told reporters during a meeting with Canadian Prime Minister Justin Trudeau Justin Pierre James TrudeauCanada says former ambassador to US violated conflict-of-interest law No new Canadian COVID-19 deaths reported for first time since mid-March Trudeau announces millions for first 'Black Entrepreneurship Program' MORE. “I find it hard to believe it was intentional, if you want to know the truth.”