Officials reported that human remains have been discovered at the location of a large fireworks warehouse explosion in Northern California earlier this week. As of now, seven individuals remain unaccounted for.

According to a statement from Yolo County, they did not specify the number of human remains found at the explosion site, which is near Esparto, to the northwest of Sacramento. The incident occurred on Tuesday when the warehouse caught fire and exploded.

Relatives of the seven missing people have expressed frustration with not knowing the fates of their loved ones.

Fire authorities noted that the area continues to burn and there are still explosives present, which necessitates exercising caution during recovery efforts. They have requested the public’s patience in this process.

“At this time, no positive identifications have been made,” Yolo County said in a statement.

Once identifications are made, next of kin will be notified before the names are publicly released, it said.

The cause of the fire and explosion remains under investigation, officials said.