The Maine Warden Service, the Oxford County Sheriff’s Office and the U.S. Border Patrol are searching for two men who witnessed the death of a canoer on Papoose Pond in Waterford.

Game wardens were dispatched to Papoose Pond at 8:42 a.m. Saturday after being notified of an unresponsive person in the water, Mark Latti, spokesperson for the Maine Department of Inland Fisheries & Wildlife, said in a statement emailed Monday night.

An Oxford County sheriff’s deputy and emergency medical personnel were on the scene at Papoose Pond when game wardens arrived, and U.S. Border Patrol officers arrived soon after, Latti said.

“An initial investigation revealed that four men had been out on the pond in three canoes when one of the canoes capsized, throwing the two occupants of the canoe in the water,” he said.

The two other canoers were able to get the two people in the water to shore, but one, identified as Pedro Quizhpi, 50, of Ecuador, was found unresponsive at the scene.

“Despite efforts to revive him by CPR, he was deceased when the Oxford deputy sheriff arrived,” Latti said.

The other capsized canoer told game wardens that the canoe flipped unexpectedly and that he couldn’t remember what happened after that.

The two people in the other two canoes had left the scene before wardens arrived, according to the statement. The Oxford County Sheriffs Office and Border Patrol released a bulletin for departments to be on the lookout for two vehicles.

One of the two vehicles was stopped by Scarborough police in Scarborough on Saturday around 11:05 a.m., the department said in a statement issued Monday.

The vehicle contained eight occupants, according to the police department’s statement, and four additional Scarborough officers and a Cumberland County sheriff’s deputy arrived to assist.

“Our department was advised the Border Patrol had extensive travel time from Oxford County and the Maine Warden Service would be responding as the primary agency to investigate the suspicious death,” Scarborough police said.

When the wardens arrived, Scarborough officers left the scene, the department said.

Wardens discovered that none of the occupants were the witnesses to the incident.

“Game wardens interviewed the occupants and determined the men who witnessed the drowning were not in this particular vehicle but likely in the other vehicle,” Latti said. “The other vehicle has not been located.”

It remains unclear whether anyone was detained during that stop. Scarborough police forwarded all inquiries to the Maine Warden Service.

“I can only speak for us, but we did not detain anyone,” Latti wrote in an email Tuesday. “Border Patrol did arrive as we were finishing, and were there when we left.”