A fire damaged 40 decommissioned SEPTA buses, including 15 electric buses, at a Philadelphia storage yard on Thursday.

The fire, which sent a thick plume of black smoke into the sky visible across the city, began sometime before 6:15 a.m. Thursday morning, according to SEPTA spokesperson Andrew Busch.

A fire at SEPTA's Midvale Bus Depot in Philadelphia engulfed 40 buses, causing air quality concerns and a health advisory.

Footage from the scene in Philadelphia shows a massive cloud of black smoke billowing into the skies, with firefighters ...