A manhunt is under way after two men were attacked by thugs who stole thousands of pounds after arranging dates using the Grindr app.
A police appeal revealed both incidents happened in broad daylight in public areas of Norwich 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 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.
Detective Chief Inspector John Beales said: "We want to reassure the public that these reports are being taken extremely seriously and that we are actively investigating the offences and motives of those exploiting the app."
The dating app has been used by various gangs for similar crimes and last year two men were jailed for their part in "London's most prolific Grindr gang" after they targeted multiple men per week.
They stole 21 stole phones, passports and wallets in 35 burglaries and 20 related frauds, totalling £68,000 over six months.
One victim had to be admitted to hospital with stress when loans and overdrafts were taken out using their name.
Officers have asked anyone who may have relevant information about the robberies in Norwich to contact the force, using the reference 36/62725/26.
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