The dating app which was used by thugs to attack and rob two men in Norwich has encouraged users to report "suspicious" behaviour.
On Friday, Norfolk Police announced they were searching for the men responsible for the incidents that happened in broad daylight in public areas last month.
The first involved a man who was assaulted, had his phone stolen and more than £1,000 transferred out of his account.
It happened at Gildencroft Quaker Cemetery in Chatham Street at 11.13am on August 21.
The meeting was arranged through the app Grindr which is described as "a location-based social networking and dating mobile application designed primarily for gay, bisexual, trans and queer people".
Another man was targeted by the Grindr gang when three men in balaclavas attempted to rob him at 10.55am on August 29 while walking through the same cemetery.
Later that day, at 2.04pm, another victim met a man at Gunton skateboard park in Marl Pit Lane. They had also connected this attack through Grindr.
During a walk in nearby woodland, the victim was jumped by one of the men before two others joined in.
His phone was stolen and £3,000 was transferred to a bank account.
A man in his 30s has been arrested on suspicion of robbery and attempted robbery.
He was questioned at Wymondham Police Investigation Centre and has been released on bail until November 29.
A spokesman for Grindr said: "At Grindr, we take our role as a connector for the queer community seriously and work diligently to provide a safe environment for our users.
"We have a range of measures in place to help protect our community, including robust moderation, in-app reporting and blocking tools, and in-app safety resources.
"We strongly encourage users to report any suspicious behaviour and utilize our video calling feature to verify connections before meeting in person, and to report illegal behaviour within the app or to local authorities.
"Grindr responds to and cooperates with law enforcement to aid in their investigations of incidents, including through Kodex, a secure platform we use to respond to valid information requests from UK law enforcement."
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