WARREN (AP) — Authorities are investigating the cause of a natural gas pipeline rupture and explosion in far northwestern Minnesota.

The Marshall County sheriff's office received a call about a large fire about three northwest of Warren just before 6:30 a.m. Monday. Flames were shooting over 100 feet into the air from a farm field.

The county's 911 coordinator, Jim Duckstad, says nobody was injured, but six or seven families living within two miles of the site were evacuated. He says the gas line was shut down and the fire extinguished itself around 8:30 a.m.

Duckstad says natural gas to the cities of Warren and Argyle may remain shut off for a couple days.

The pipeline is owned by Viking Gas Transmission Company, which sent crews to the scene.