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An Amtrak train traveling south through central Vermont careened off the track Monday morning after striking a rockslide, officials said.

The 10:30 a.m. ET accident occurred in the town of Northfield, about 10 miles south of Montpelier, the state capital. The train was carrying 98 passengers and four crew members.

Five passengers and two crew members were hurt, one seriously. None of the injuries appeared life-threatening, authorities said.

Vermont Gov. Peter Shumlin blamed a "freak of nature," saying a rock ledge above the train's path broke off and tumbled onto the tracks, which are also used by freight lines.

Five cars jumped the tracks, including the locomotive and lead passenger car, which fell into a brook. Shumlin said it did not appear the driver could have done anything to avoid the collision.

Amtrak Vermonter train #55 derailed south of Northfield, Vermont, after striking a rock slide on the New England Central Railorad's Roxbury Subdiivision. Amtrak P42DC #102 - the locomotive - and one Amfleet car careened off the rock and were sent down an embankment and through a forested area. The engineer was airlifted to Dartmouth-Hitchcock Medical Center and 2 other crew as well as four passengers were treated and released from Central Vermont Hospital in Barre. Kevin Burkholder

The governor said passengers told him that the train did not appear to be traveling faster than the 59 mph speed limit. The track itself was state-of-the-art, and a freight train passed through the area Sunday night without incident, he said.

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"There is no reason at this time to believe that there was any negligence on anyone’s part," Shumlin said.

Nonetheless, investigators will examine inspections records for the track, which is owned by New England Central Railroad, he said.

The National Transportation Safety Board and the Federal Railroad Administration sent investigators to the scene. The Federal Railroad Administration announced that the rock slide was the preliminary cause of the derailment.

A passenger who was with his wife on a sightseeing trip said the ride was smooth until "we felt something hitting the train, which wasn't normal, and then all hell broke loose."

The engineer hit the brakes quickly, "but it was too late," Rodger Bell said.

The Bells, from Windsor, Colorado, were "tossed around a bit" but weren't hurt, the husband said.

He recalled seeing a set of wheels roll past his window just before his car jumped the tracks and ended up on a small embankment.

Ahead of him, the engine tumbled down a creek bed, he said.

The train was the “Vermonter,” the daily service that runs between St. Albans, Vermont and Washington, D.C. It is the only Amtrak service that runs on the track. It had just left Montpelier and its next scheduled stop was in Randolph when it derailed.

A conductor was among the injured, Gina Conn, a reporter for the Times Argus newspaper, told MSNBC.

An Amtrak train derailed Monday morning in central Vermont, state police told NBC News. BrianABell1980 via Twitter

The train is popular at this time of year with tourists looking to soak in the annual fall foliage throughout Vermont and New England. It travels 600 miles between northwestern Vermont and the nation’s capital. In 2014, the Vermonter served 88,000 passengers — about 241 per day.

Bell said that after he and his wife got out of their car, they walked down the tracks and gathered with other passengers in a nearby yard, awaiting information on the next step. He said rescue workers "are doing a wonderful job, checking on everybody, making sure they are accounted for."

Several dozen passengers were put on school buses headed for an armory near Norwich University, a private military college in Northfield, The Associated Press reported.

The accident will put the Vermonter out of service north of Springfield, Massachusetts, for the foreseeable future, as crews remove the rocks, clear diesel fuel from the brook and rebuild the tracks, Shumlin said. Passengers who plan to use Amtrak service in that area will be bused to all stations between Springfield and points north along the route.