The game allows players to buy a “lure module” to attract Pokemon - which as a result will also lure in other players.
Concerns have also been expressed about the safety of children playing Pokemon Go.
GMP warned that the lure modules may alert predators to where youngsters are planning to be, and the NSPCC claimed that “basic safety standards appear to have been overlooked” in the creation of the app.
Maker Niantic said: “We take player safety seriously and want everybody to have a fantastic time exploring while safely playing Pokemon Go.
“We encourage all people to be aware of their surroundings and to play with friends or family, especially when you’re exploring unfamiliar places.
“Please remember to be safe and alert at all times, don’t drive and play, abide by local laws, and respect the locations you visit and people you meet during your exploration.”
However, the app has also been used in the fight against crime.
South Yorkshire Police praised a group of players who came across a burglary at an industrial estate in Doncaster on Sunday and alerted the force.
An entry on the SYP Operational Support Facebook page said: “Our control room took a call from a group of friends. These friends had been in the Wheatley area of Doncaster playing #PokemonGo, looking for those pesky little creatures on their app. They travelled down a side road into an industrial [estate] and saw something suspicious in a builders yard. Dilemma...search for Pokemon or call the cops?
“Thankfully these budding search heroes called 999 to report what they had seen.”
And a crime scene investigator for Surrey and Sussex Police, Chris Gee, appealed to players who may have witnessed a burglary at a Tesco garage in Durrington, West Sussex just before 1am on July 16.