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Officials say they need more time to recover the single-engine plane that crashed into southwestern Colorado reservoir Saturday, leaving five occupants dead, according to investigators.

Sonar images reviewed on Sunday reveal that the fuselage of the Socata TBM700, along with the bodies of the victims, are intact according to officials in Ouray County.

None of passengers on the plane has been identified.

Authorities said the plane crashed about 90 feet from shore in 60 to 90 feet of water in the Ridgway State Park reservoir.

"It's in deep water and it's in cold water, and we don't have the right resources in the county" to recover the plane, said Ouray County spokeswoman, Marti Whitmore.

Dive teams from Denver and Gunnison on Sunday marked the location of the wreckage as efforts focused on finding the victims and the main body of the aircraft, Whitmore said.

Recovery resumed Monday and arrangements were made to bring more crews and equipment to the scene.

The plane was heading from Bartlesville, Okla., to Montrose, about 180 miles southwest of Denver. It went down in the reservoir around 2 p.m. Saturday about 25 miles south of Montrose.

The flight took off from Gadsden, Ala., before stopping in Oklahoma, Federal Aviation Administration spokesman Ian Gregor said. The cause of the crash isn't yet known.

— Nadia Sikander

The Associated Press and Colorado’s KUSA contributed to this report.