Firefighters expect a massive wildfire in eastern Arizona to become the largest in state history later Wednesday.

The 747-square-mile fire has destroyed 32 homes and forced thousands of people to evacuate.

Arizona's largest fire was the 2002 Rodeo-Chediski fire, which burned 732 square miles but destroyed far more buildings - 491.

While the current fire has surpassed Rodeo-Chediski in size, it still wasn't considered Arizona's largest fire as of Wednesday morning because "several thousand of the 478,452 acres that have burned were in New Mexico, where firefighters had intentionally set blazes to keep back uncontrolled flames," said Sean Johnson, fire spokesman.

Officials expected the blaze in the Apache-Sitgreaves National Forest, which is "chewing up thousands of acres a day, to become the state's largest by morning," he said.

Evacuation plans are in place for the small mountain town of Luna, New Mexico just across the state line. Fire crews have been working to protect the town for several days.

Meanwhile, authorities say two people are being questioned about an abandoned campfire that may have started the huge wildfire.

Several other fires were also burning around Arizona, including a huge blaze near the southeastern border town of Portal that has burned more than 267 square miles since May 8. It was about 60 percent contained. Another fire that broke out, Sunday, outside Sierra Vista near the Coronado National Memorial also forced evacuations.