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Major delays on the Metro’s Orange and Blue lines were due to a friction ring falling off of a moving train Tuesday morning, according to the Washington Post.

The ring, similar to a brake disc on a car, disconnected from the train just outside the L’Enfant Plaza station around 9:45 a.m. while the train was moving, according to the Washington Post. Trains started single tracking around the station by 1 p.m. and no serious injuries were reported.

Metro says they will inspect the brakes on all of their 5000 series cars and will investigate why the friction ring fell off the train Tuesday. Metro General Manager Richard Sarles said it is rare for one of the parts to fall off, according to the Washington Post.

According to the Washington Post, the friction ring fell off a Blue Line train causing a spark and some smoke. The ring landed between the subway system’s third rail and the running rails of the track. According to the Washington Post, two Orange Line trains behind the disabled train heading toward Vienna were also damaged. Passengers were evacuated from the platforms and train with one passenger allegedly having an anxiety attack, according to the Washington Post.

Check out the Unsuck DC Metro blog about this incident by clicking here.