Two people were injured — one of them more seriously than the other — when a plane belonging to U.S. Customs and Border Protection Air and Marine Operations experienced engine trouble and crashed in Burnham Wednesday night after attempting to land at the Pittsfield Municipal Airport, officials said.

The plane, a Cessna 206, was conducting border security operations when it experienced a suspected engine failure shortly before midnight, said Stephanie Malin, branch chief for the U.S. Customs and Border Protection Office of Public Affairs northern/coastal region, in an email.

Two people were on board the plane and reported an emergency off-field landing near the Pittsfield Municipal Airport, Malin said. State police say one crew member called 911 and reported their location after the crash.

Both were able to walk away from the wreckage but were taken to a local hospital for medical attention and evaluation, police said. One crew member was still being treated as of Thursday morning, Malin said.

Maine Department of Public Safety Spokesman Steve McCausland said the crash took place around 11:15 p.m. Wednesday in Burnham near the Sebasticook River. He said one of the occupants of the plane had more serious injuries and had been taken to a hospital in Boston after initial treatment at Sebasticook Valley Hospital in Pittsfield.

McCausland said he did not have the identities of the two injured people. He referred questions on the identities of the plane’s crew to Customs and Border Protection.

Thursday morning, Burnham Fire Chief Charlie King could be seen near the scene speaking with game wardens who arrived in a boat at a staging area on the Sebasticook River along Peltoma Avenue in Pittsfield.

Responding to the crash site initially were State and Pittsfield police, Somerset Sheriff’s deputies,  Maine Game Wardens, Pittsfield Fire Department and Redington-Fairview Ambulance.

Troopers provided security at the crash site, and were later joined by an FAA investigator, members of the Maine Department of Environmental Protection, Customs and Border Patrol Agents, and Maine Game Wardens, according to a press release from McCausland.

It is not known when the plane’s wreckage will be moved, he said. The crash investigation will be conducted by the FAA, according to McCausland.