A 64-year-old man in a wheelchair who fell in front of a train as it was pulling into the Hayward BART Station remained hospitalized late Saturday, officials said.

The incident occurred at about 2:50 p.m. Saturday, said BART spokesman Linton Johnson.

"It appears to be an accident," Johnson said. "There's no indication of foul play." He cautioned, however, that the investigation is ongoing.

He said witnesses reported that the man appeared to be adjusting the position of his wheelchair as the Richmond-bound train was arriving and that he somehow lost control after a wheel rolled off the edge of the platform. The man, identified by Johnson as Curtis Fuller, 64, fell onto the tracks and was run over by the train. A station agent climbed underneath the train to check on Fuller's condition before emergency medical crews arrived. He was breathing but unconscious when he was removed from the tracks, Johnson said.

Johnson also reported that a gun was found on the track, but does not know if it was related to the accident.

A spokeswoman for Eden Medical Center would not release details of the extent of Fuller's injuries, at his family's request. Earlier, a nursing supervisor said he was being treated in the trauma room and was expected to be admitted to the critical care unit.

Train service was briefly stopped between the Bay Fair Station in San Leandro and the Fremont Station. Later, trains in both directions ran on a single track through the Hayward Station, resulting in delays of 15 to 20 minutes until the train involved in the accident was moved a little before 5 p.m.