Service on the Ronkonkoma and Port Jefferson branches of the Long Island Rail Road was partially restored Thursday morning after service was suspended earlier because a man was struck and killed by a train, according to the Metropolitan Transportation Authority.

But service on the Oyster Bay branch remained suspended in both directions as the MTA continued its investigation into the incident, which occurred at about 7 a.m., according to the agency.

The transportation agency earlier had halted service in both directions on the three branches after a man on the tracks was hit by a westbound train at the Mineola station, LIRR spokeswoman Nancy Gamerman said. 

There was no additional information about the circumstances of the incident immediately available Thursday morning, including why the man was on the tracks.