American Airlines planes and passengers at the O'Hare International Airport, Chicago.

A fire at a Federal Aviation Administration outpost in Chicago has spilled over into air traffic from O'Hare and Midway International airports, NBC Chicago reported on Friday.

According to the report, local firefighters were called to the Chicago Terminal Radar Approach, with no reported casualties. NBC Chicago also reported that all departures from both hubs were grounded, and pilots were instructed to turn off their engines.

O'Hare is the U.S.'s second-largest airport, carrying more than 15 million passengers yearly.

Full details can be found at NBC's Chicago affiliate.