CNN -

An Amtrak train slammed into a Long Island Rail Road commuter train parked at New York's Penn Station during Monday rush hour, causing minor injuries to 130 people, the New York Fire Department said.

Emergency crews evacuated at least a dozen passengers on stretchers and treated some on the scene.

It was unclear what caused the accident.

Witnesses said a Long Island Rail Road train was inside the station on Track 14 when it was hit by the Amtrak train.

Three crew members were on the Amtrak train, but no passengers were on board, said Dan Stessel, an Amtrak representative.

Most passengers on the Long Island Rail Road train were allowed to leave after paramedics examined them. The injured were tagged according to the degree of their injuries, fitted with neck braces and told to sit until they could be removed.

The train station was full of National Guard personnel and police officers, who have been on the scene regularly since the September 11, 2001, attacks.

"We have received no report of injuries to our crew members and won't know the cause of the collision for some time," Stessel said.

Delays on the Amtrak service range from 15 to 30 minutes, but these may be extended, Stessel said. The Amtrak train left just before 7 a.m. ET from Sunnyside in Queens and was making its way to Penn Station, Stessel said.

Train service on the Long Island Rail Road line was being diverted to the Flatbush Avenue terminal. The struck commuter train departed from the Long Island town of Ronkonkoma at 5:42 a.m. ET.

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