A 9-year-old boy fell down a flight of stairs and fractured his skull Sunday morning after he got caught up in a fight at the CTA’s Green Line, according to Chicago police.

Surveillance video shows the boy exit a Green Line train with a 22-year-old man who was arguing with two other men around 11:15 a.m., according to an initial police report obtained by the Chicago Sun-Times.

As the argument turned physical, the 22-year-old and child ran from the Clinton station platform, 540 W. Lake St. The man scooped up the 9-year-old “as he was not keeping up,” according to the police report.

As they went down the stairs, one of the two suspects struck the 22-year-old in the back with an object, causing him and the child to fall down the flight of stairs, police said in a statement Monday. The 22-y

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