The number of missing or unaccounted for people in the northern Californiawildfire soared to 631 on Thursday, authorities said, an increase of more than 500 since Wednesday.

The news came as the death toll in the Camp fire increased to 63 after authorities recovered the remains of an additional seven people.

The remains were found outdoors and in the rubble of homes and cars in the towns of Paradise, Magalia and Concow.

One victim was found in a overturned charred car in Paradise.

The revised official roster of 631 individuals whose whereabouts and fate remained unknown is more than double the 297 listed earlier in the day by the Butte county sheriff’s office.