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Pokemon app on phone

Pokemon Go is displayed on a cellphone in Los Angeles on Friday, July 8, 2016. Just days after being made available in the U.S., the mobile game Pokemon Go jumped to become the top-grossing app in the App Store. (AP Photo/Richard Vogel)

KIRKWOOD • A 71-year-old man and his adult son beat up a Pokémon Go competitor who accused them of cheating and threw a plastic bottle in their car, police say. 

A bystander's video captured the assault Monday in the 500 block of West Adams Avenue, near North Geyer Road and Kirkwood Park, according to court documents. Kirkwood Police did not release the video. 

St. Louis County prosecutors filed charges Tuesday against Robert Matteuzzi and his son Angelo Matteuzzi, 31. Each faces one count of assault in the third degree.

Pokémon Go is an augmented reality game for smartphones in which users can hunt, capture and do battle with virtual monsters that appear in real-life locations, some of which are specially marked "gyms" that belong to different teams. 

Users can battle one another to obtain control of the gyms and can claim open gyms by walking up to them and assigning a Pokémon character to them. 

While playing Pokémon Go, the assault victim thought the Matteuzzis had cheated in the popular game by stealing his "gym" and then threw a Gatorade bottle into their car, Kirkwood Police Officer Matthew Waggoner wrote in a probable cause statement.

The elder Matteuzzi later found the victim in another area and threw the bottle back at him, hitting him in the face, Waggoner wrote. All three men then got into a fight. 

A bystander took video of the encounter and caught Robert Matteuzzi holding the victim down while his son hit the victim's head and face several times, Waggoner wrote. The victim suffered cuts to his face, a "traumatic" eye injury and a broken finger tip, charges say.

The Matteuzzis live in the 5300 block of Minerva Avenue in St. Louis, according to court records. They were ordered held in lieu of $15,000 bail. 

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Reporter covering breaking news and crime by night. Born in Algeria but grew up in St. Louis. Previously reported for The Associated Press in Jackson, Mississippi and at the Wichita Eagle in Wichita, Kansas.