CHICAGO (CBS) — Police are holding four people who allegedly attacked a man and robbed him of his iPhone at the Harrison Street Red Line subway station late Wednesday.

The 20-year-old victim was standing at the Harrison platform around 10:45 p.m. Wednesday, when a group of three to five males walked up and punched him in the face, police said.

They pushed the man to the ground and took his wallet and iPhone before running away, police said.

Four persons of interest are in custody in connection with the attack, but no charges have been filed as of early Thursday, he said.

Circumstances surrounding their arrest were not immediately known.

The Sun-Times Media Wire contributed to this report.

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