More Medway schools have warned children about the potential dangers of a new game which has become an obsession with youngsters.

The Pokémon Go craze, which is sweeping across the nation, encourages players to catch the creatures in real places with cameras on their mobile phones.

The app uses satellite navigation to detect where players are and make the characters “appear” around them.

Players can put a lure on these so called Pokéstops which means more of the critters will appear, encouraging more people to visit these locations. The Strand, Diggerland at Medway Valley Leisure Park and Rochester High Street, are popular hotspots.

But schools are concerned they may be in isolated areas and feel that youngsters could be at risk if they visit them on their own.

Chatham Grammar for Girls, Robert Napier School, The Thomas Aveling School, Fort Pitt Grammar School and Cliffe Woods Primary School have warned pupils about possible stranger dangers.

The app has been banned at Rochester Math School after a highly sought-after Pikachu was found in a Year 8 classroom, causing a furore.

The creatures have even been caught in Rochester Cathedral.

Conor Diggin, 21, graduated from the University of Kent on Tuesday, but moments before he received his certificate from the dean, he caught a Shellder.

Andrew Minchin, head teacher of The Robert Napier School, sent a letter home to parents.

He wrote: “Some of these PokéStops can be in isolated locations and we feel parents should be advised that their children should approach these locations with the old adage of ‘stranger danger’ in mind.

“We are already aware that many of our students are very much enjoying playing Pokémon Go, but we have spoken to them about the importance of keeping themselves safe while playing, and being mindful of road safety as well as ‘stranger danger’.”

Fort Pitt Grammar School has also sent out a letter warning parents while staff gave a presentation to pupils to highlight the dangers.

The letter, which also includes advice from the police, warns students to be wary of their surroundings, avoid trespassing, and to keep an eye on battery and mobile data use.

In the letter, assistant head, Helen Gordon, wrote: “Our aim is to keep your daughter/son safe and to alert you as to any potential dangers. We will confiscate mobile phones if they are seen being used in school.”

The Thomas Aveling School have created a fact sheet for parents which is available online and will be in the school’s end of term newsletter. Their tips include making sure pupils stay away from private property and that they check their mobile data usage.

The head teacher of Cliffe Woods Primary School, Tim Muggridge, issued a letter to parents outlining the potential risks including muggers waiting at PokéStops and the dangers of battery drainage.

The NSPCC has said it feared the game could be “hijacked” by those who wish to harm children.

The children’s charity encouraged the developers to implement some form of safety features before the app was released in the UK, last week.

A spokesman said: “Given its massive popularity with children it’s worrying that this game appears susceptible to being hijacked by those who may wish to harm them.

“When creating these game companies must consider the potential risks to young users and do everything they can to make sure their app doesn’t put them in danger.”

Others commended the game for encouraging people to get on their feet.

It requires you to explore your local area if you want to succeed and also offers rewards based on how far you travel.

It offers distance tracking in the same vein as popular fitness apps.