Residents near a Pennsylvania aerospace manufacturing plant that caught fire Monday night have been asked to voluntarily evacuate as officials worry about air quality conditions. The blaze broke

The fire broke out at around 9:30 p.m. Monday, and witnesses said there was an explosion and that flames could be seen inside the warehouse, the Abington Township Police Department said in a statement on social media.

Officials have asked residents living on certain roads to voluntarily leave the area due to air quality concerns.