A helicopter crashed and burned Saturday afternoon in a rural area near Lakeville, Minnesota, killing everyone on board, officials said.

The National Transportation Safety Board said the crash occurred under unknown circumstances and that a post-crash fire ensued. Lakeville police and online flight-tracking data indicated the single-engine Robinson R66 took off from Sky Park Airport in Lydia at about 2:35 p.m. and went down roughly eight minutes later while en route to Airlake Airport.

FlightAware data shared by authorities showed the helicopter reached a peak altitude near 2,000 feet before descending rapidly and crashing in a remote area near Highway Avenue and 219th Street West, about 25 miles south of Minneapolis. Lakeville police said first responders found no survivors at the scene but had not confirmed how many people were aboard.

The Robinson R66 is a light, turbine-powered helicopter certified to carry a pilot and up to four passengers. Police said no one on the ground was injured. Local emergency crews secured the scene while federal investigators began an inquiry.

The NTSB said it has opened an investigation into the accident. The agency typically examines wreckage, reviews maintenance and operational records, analyzes any available flight-tracking or audio data, and interviews witnesses as part of its work to determine probable cause. The Federal Aviation Administration often coordinates with the NTSB on such investigations.

Authorities have not released the identities of the victims or additional details about the flight’s purpose. Investigators said they would provide updates as more information becomes available. There was no immediate indication from officials that nearby airports were affected by the incident.

Crash investigations of small civil helicopters have in past years focused on factors including mechanical failure, pilot error, maintenance issues and weather, but officials cautioned that it is too early to draw conclusions about the cause in this case. The NTSB’s preliminary statement emphasized that the circumstances leading to Saturday’s crash remain under review.

Local police, state authorities and federal investigators remained on scene into Saturday evening. The NTSB will release findings as its examination proceeds and will ultimately publish a report detailing the agency’s conclusions and any safety recommendations.