TUCSON, Ariz. (AP) — The Southern Arizona Chapter of the American Red Cross will be deploying four volunteers to Northern California shelters to help residents displaced by the ongoing wildfire.

The volunteers will be leaving Monday.

The deadly wildfire has forced tens of thousands of people to flee their homes.

The fire grew slightly Sunday to 139 square miles (360 square kilometers).

It's the largest fire burning in California, threatening more than 5,000 structures.

The latest tally showed at least 517 structures destroyed and another 135 damaged.