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BOISE, Idaho — Airport officials facing jet fuel shortages are concerned they’ll have to wave off planes and helicopters that drop fire retardants during what could be a ferocious wildfire season, potentially endangering surrounding communities.

Thousands of railcars loaded with grain are idled in the Vancouver corridor after Western Canadian wildfires damaged two main lines, while repairs enable a small but rising number to reach the country’s biggest port.

The Federal Highway Administration has directed funding to assist with repairing infrastructure that has been damaged by wildfires in Oregon and California.

An extended stretch of Interstate 5 in Shasta County has reopened with restrictions after five days of closure caused by the raging Delta Fire, which has ignited big rigs and cars, injured at least one person and consumed more than 49,000 acres as of Sept. 10, according to the U.S. Forest Service.

REDDING, Calif. — An explosive wildfire that closed down dozens of miles of a major California freeway nearly tripled in size overnight, just weeks after a nearby blaze that left neighborhoods in ruins and killed eight people, officials said Sept. 6.