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.
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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.
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