A water bomber makes a pass on a section of forest fire Saturday near Thunder Bay, Ontario. A forest fire has jumped the U.S.-Canadian border from Minnesota into Ontario, causing officials to evacuate several hundred near Thunder Bay.

Avalon, Calif. ? Cooler weather aided firefighters Saturday as they battled to surround a 4,200-acre wildfire in the rugged, unpopulated interior of Santa Catalina Island while the resort’s main town returned to life as the blaze’s threat eased.

The fire was about two-thirds contained and was expected to be encircled by Tuesday evening, Los Angeles County Fire Capt. Andrew Olvera said. One home and six businesses burned Thursday, but no one had been seriously injured.

Nearly 4,000 evacuated residents had started returning to the island, where damage was estimated at $2.1 million.

“We have a sense of duty to the town to bring it back to normal,” delicatessen owner Rick Miller said as he unloaded supplies from his van. “People get hungry, and it doesn’t hurt to see businesses open and calm restored.”

Fog and highs only in the 60s diminished the threat of the fire spreading. It was isolated in the back country of the 76-square-mile island, more than 20 miles off the Southern California coast.

The fire appeared to have been ignited by contractors working on antennas at a radio station in the island’s interior, Avalon Fire Chief Steven Hoefs said.

Elsewhere, smoke from a mammoth wildfire in the Southeast closed sections of two major highways Saturday. Crews were still battling a wildfire in Georgia and northern Florida that had burned 212,000 acres – or more than 330 square miles – since lightning ignited it a week ago.

Florida officials closed a 35-mile stretch of Interstate 75 from the Georgia-Florida state line to Lake City, Fla., as well as a 40-mile stretch of I-10 Saturday morning because near-zero visibility from smoke. Georgia authorities closed the southbound lanes of I-75 for about 15 miles from Valdosta, Ga., to the state line.

The fire, which started in the middle of the Okefenokee National Wildlife Refuge, took just six days to grow larger than a separate wildfire that had burned 124,000 acres of Georgia forest and swampland in more than three weeks.

Near the Canadian border, some evacuation orders were lifted in northeastern Minnesota, where a wilderness wildfire had blackened about 85 square miles of forest. However, an evacuation order was expanded across the border in Canada because of concerns about shifting wind, said Ministry of Natural Resources spokeswoman Leona Tarini.