Four people were critically injured in an explosion at a cocoa butter processing facility in New Jersey, according to local authorities.

The blast was powerful enough to shake homes across the surrounding area, with more than 7,000 residents living within several miles of the facility reporting they felt or heard the explosion. Many residents captured video footage showing their homes being shaken by the force of the blast.

Emergency responders arrived at the scene following the incident at the processing facility. The extent of damage to the facility itself has not been disclosed.

The cause of the explosion remains under investigation. No additional details about the injured workers or their current condition have been released by authorities.