Service has been suspended on the Montauk branch of the Long Island Rail Road between Babylon and Montauk after an unauthorized person on the tracks was struck and killed by a train, an LIRR spokesman said.

The person, who was not identified by name, age or gender, was hit east of Sayville at about 8:50 a.m. by an eastbound train from Babylon destined for Speonk, spokesman Sam Zambuto said.

The Speonk-bound train, which Zambuto said carried between 20 and 30 passengers, is being held at the scene of the collision.

The other train affected by the temporary suspension — the 8:10 a.m. train from Jamaica headed to Montauk — is being held at the Sayville station.

Zambuto said the LIRR is in the process of establishing bus service to replace the disrupted trains.

Metropolitan Transportation Authority police are investigating the incident.

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