HARTFORD, Wis. (CBS 58) -- A train derailment involving multiple engines and rail cars occurred in Hartford, causing minor injuries and a diesel spill in a contained area, according to Hartford police chief Scott MacFarlan.

It reportedly happened Monday, June 30, when three engines left the track and more than 10 rail cars were involved.

Three people inside the lead engine were taken to Aurora Medical Center for treatment.

Officials said the diesel spill remained localized and crews are working to contain it. Hazmat teams, Hartford Fire and Emergency Management, Dodge and Washington County units and other fire departments responded to the scene.

No other hazardous materials were reported. Police said local businesses were notified as a precaution. Traffic remains open on Independence Ave. and no evacuations have been ordered.

HARTFORD, Wis. (CBS 58) -- A witness has told CBS 58 about the aftermath of a reported Monday morning trail derailment near Hartford.

John Leverance tells our team, "It looked bad, from what I could see. At least four engines, one on its side and I'd say roughly ten cars."

CBS 58 will provide more details as they become available.