TOLEDO, Ohio (AP) — Police in Cleveland say they've found no evidence suggesting three dogs were tied up on a railroad track or two of them were killed by a train, as they initially believed.

Authorities are now unsure whether it happened at all.

Cleveland police say an animal control officer told officers about the dogs after he spoke with a railroad worker who said he witnessed a dog being tied to the tracks. The worker also said someone appeared to take photographs or a video.

A police commander said Monday all they know now is one dog narrowly missed being hit by a train. But it's unclear if the dog had been tied to the tracks.

Reports of the dog deaths last week outraged animal welfare groups.