Video shows the moment a man wearing a black "I (heart) NY" sweatshirt and a backpack hit the 67-year-old "Ghostbusters" star and knocked him to the ground.
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It happened Thursday at 7:24 a.m. on West 70th Street near Central Park West.
Friday afternoon police released a clearer image of the suspect.
The attack happened just a few blocks from the apartment building where Moranis' character, Louis Tully, lived in the movie.
The attacker continued walking north after throwing the punch.
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Moranis hurt his head, back and hip in the attack but was able to take himself to the hospital, and later, to the police station to report the incident.
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Moranis' representative Troy Bailey said in a written statement Friday: "Rick Moranis was assaulted on the Upper West Side yesterday. He is fine but grateful for everyone's thoughts and well wishes."
Moranis shot to fame in the 1980s as a star of the sketch comedy series "Second City Television," before landing roles in blockbuster movies like "Ghostbusters" and "Honey I Shrunk the Kids."
He put acting aside in the late 1990s to focus on raising his kids but has made occasional appearances since.
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Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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Fellow actor Chris Evans, who portrays Captain America in the Marvel movie franchise, reacted to the attack on Twitter.
Information from the Associated Press was used in this story.
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