A shelter-in-place order​ remains in place and voluntary evacuations have been ordered around the SPS Technologies facility after a massive fire broke out Monday night.

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

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.

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 out at SPS Technologies in Jenkintown around 9:30 p.