DETROIT – Many Metro Detroit residents were awakened by an emergency notification early Monday morning after an explosion at an apartment complex in Detroit.

Multiple people were injured in the explosion at the apartment complex off Littlefield on March 31. At least 12 people were rescued.

Related: What we know about possible Metro Detroit explosion that triggered emergency alert

It’s believed the explosion happened at around 4 a.m., but the notification was sent out around 6 a.m.

“POSSIBLE EXPLOSION AT 13910 LITTLEFIELD/UNCONFIRMED AT THIS TIME. UNKNOWN CAUSE.”

Some residents may have received a notification that was labeled as extreme, while many received an emergency notification.

The Detroit Fire Department confirmed with Local 4 that they sent the notification in error.

The notification was meant to be sent only to residents in the surrounding area of the possible explosion but was sent to multiple areas in Metro Detroit by mistake.