GRIDLEY, Calif. (AP) — Authorities said Thursday that at least 10 people have died in a massive Northern California wildfire and 16 people remain missing.

Butte County sheriff's investigators found seven bodies on Thursday, a day after three other victims were discovered. Among those unaccounted for are grandparents who told their son they were going to try to escape the flames by finding shelter in a pond.

The weeks-old fire was about 50% contained when winds drove it into explosive growth on Tuesday. Some 2,000 homes and other buildings officials have burned.

The fire is among five this year...