BRUNSWICK, Maine (AP) – Firefighting foam in a hangar at Brunswick Executive Airport has been been removed, and mitigation is underway on four retention ponds following Maine’s biggest accidental spill of the fire suppressant on record, officials said Monday.

The Maine Center for Disease Control and Prevention advised the public not to consume or to limit consumption of freshwater fish from four nearby bodies of water following the accidental discharge of firefighting foam containing harmful chemicals known as PFAS.

An investigation is underway into why a fire suppression system discharged Aug. 19 in Hangar 4, releasing 1,450 gallons (5,490 liters) of firefighting foam concentrate mixed with 50,000 gallons (190,000 liters) of water at the former Navy base. Federal records show the spill is the biggest accidental discharge in Maine since its recordkeeping began in the 1990s.

Aircraft that were doused are undergoing a final cleaning inside the hangar, and then the hangar will be cleaned for a final time, officials said Monday. Four vacuum trucks were deployed to remove foam from the retention ponds, officials said.

PFAS are associated with health problems including several types of cancer, and they are found in everything from food packaging to clothing, in addition to firefighting foam. Last year, the Environmental Protection Agency, for the first time, proposed limits on the so-called forever chemicals in drinking water.

The Maine Department of Environmental Protection is overseeing the remediation at the former Brunswick Naval Air Station, now known as Brunswick Landing. The base, which officially closed in 2011, had automated fire suppression in large hangars that once housed P-3 Orion patrol aircraft and other planes.

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A van rolled over on the Maine Turnpike on Monday morning, spraying nails, construction equipment and power tools across the highway and injuring multiple people.

Maine State Police said troopers responded to a report of a crash on the Maine Turnpike in Ogunquit at 8:12 a.m.

Their initial investigation indicated that the driver of a commercial van was traveling north on the highway when he lost control of the vehicle on wet pavement and rolled over in the median. Debris including roofing nails, construction equipment and power tools were thrown from the van into all three southbound lanes.

A Honda that was driving south on the Maine Turnpike struck some of the construction debris, disabling the vehicle and deploying its airbags, which caused minor injury to the female driver.

The driver of the van, identified by police as 39-year-old Victor Miguel Cedillo Merchan, of Brockton, Massachusetts, was not injured. There were also four male passengers in the van, three of whom were not wearing seatbelts and were taken to Portsmouth Regional Hospital across the border in New Hampshire with what state police said were serious but not life-threatening injuries.

The crash remains under investigation, but police said speed and erratic operation appear to have been factors.

Multiple lanes both southbound and northbound were closed for a time due to the crash and the subsequent investigation and cleanup. All of them have since reopened.

Volunteer birders on Cadillac Mountain in Acadia National Park are turning their binoculars to the sky this month as the 30th annual Hawk Watch gets underway.

The citizen science project runs from August into November, and records sightings of migratory raptors such as bald eagles, American kestrels, peregrine falcons, and other species.

Seth Benz, with the Schoodic Institute at Acadia National Park, helped start the project three decades ago.

He said each sighting is recorded and added to a national database, helping scientists understand population trends in these apex predators.

“Oftentimes, these hawk watch sites are the early warning system for detecting what is happening with raptor populations,” he said.

In recent years, Benz said the project has documented an uptick in bald eagle and peregrine falcon populations, and registered a dip in osprey numbers.