The incident was reported Monday on the C train platform at the Clinton-Washington subway station around 1:45 p.m.
A man in his 30s was with his grandparents on the subway platform when he saw another man smoking and told him he could not smoke in the subway station.
ALSO READ | 13-year-old boy falls to death from terrace of Manhattan building
A dispute ensued and the man smoking then attacked the grandson and his 80-year-old grandfather, leaving them both bloody.
The man's 73-year-old grandmother was not spared and was pushed onto the tracks.
The train operator saw the woman on the tracks and stopped an incoming train.
The 73-year-old was taken to the hospital along with the 30-year-old and 80-year-old men.
The 80-year-old was treated and released and the 73-year-old woman was not seriously injured.
The search for the suspect continues and no arrests have been made.
ALSO READ | Woman dead, 2 men wounded in morning shooting at Bronx restaurant
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip