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COLUMBIA - The highest grossing free app on iTunes, Pokemon Go, was used in a robbery Sunday in O'Fallon. The Boone County Sheriff's Department voiced concerns of user safety on Monday.

Det. Tom O'Sullivan said players need to stay vigilant.

"Know where you're going and what you're doing. There's a lot of people out there on the internet that are looking for victims. Don't make yourself a victim," he said.

Since it was released Wednesday, the app has already been downloaded more than 7.5 million times.

The app has been blamed for car accidents, injuries while crossing the street and falls.

"These are distractions. You know I read where several people injured themselves they tripped over a curb or banged their shin against a cinder block so, when you're out walking around in public, pay attention to what's going on around you," O'Sullivan said.

Players are reporting positives for the game, saying it encourages exercise and helps them meet others that share the same interests while hunting the Pokemon.

O'Sullivan said users should be careful when they have to potential to interact in person with other gamers. 

"This is a generational thing, but I don't think its a good idea for everyone to know where you are and where you're going," he said.