A 60-year-old blind man from Brooklyn and his seeing-eye dog escaped serious injury Tuesday morning after they fell on the subway tracks in Harlem and an incoming train passed over them, authorities said.

How the man, Cecil Williams, and his black Labrador, Orlando, fell onto the A train tracks at the 125th Street Station at St. Nicholas Avenue remained under investigation, but there was no criminality suspected, officials said.

The incident occurred shortly after 9:30 a.m. on the northbound line, police said.

Danya Gutierrez, 19 years old, of Washington Heights, said she was standing on the southbound platform when she heard someone blurt out, "Oh no."

"Then I saw him falling into the train tracks," she said. "The dog fell in with him."