A Delta Air Lines flight was struck by a fireworks mortar while descending into Chicago Midway International Airport on the Fourth of July, according to the Federal Aviation Administration.

A Delta Airlines pilot landing at Chicago’s Midway Airport on July 4th reported that he felt a “big bang ” when his Airbus A319 was hit by fireworks.

The airline said the Airbus A319 was hit by a firework while making its descent at about 8:30 p.m. CDT.