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Two teenagers have been arrested on suspicion of carrying out robberies at Bluewater.
Police were called to the shopping centre in Greenhithe yesterday after 7pm following reports of gangs carrying out attacks.
Three robberies are said to have taken place and a further two attempted.
Following a search of the area, officers arrested two 17-year-old boys from London on suspicion of robbery. They are currently being held in custody while inquiries are ongoing.
Some of the alleged victims reported they were approached by a gang-of-eight and asked to feel a knife hidden in one of the suspect's pockets.
The father of a 15-year old victim slammed the shopping centre on Facebook.
Darren Smith said: "Bluewater should be totally ashamed for its complete lack of compassion and care of duty after the knife incident.
Darren Smith posted on Facebook
"We saw nobody for over two hours. They were simply left at the spot he was robbed until we arrived."
"They were both petrified. It was fortunate that someone witnessed it with a young child and called the police."
Investigating officer Detective Inspector Martin Carter thanked those who provided information already but urged others to come forward.
He said: "Reports like these are rare but unacceptable nevertheless. Officers made arrests very soon after the robberies were reported and some of the stolen property was recovered.
"We are working with Bluewater and reviewing CCTV as part of our ongoing inquiries into the incidents."
If anyone witnessed any of the incidents taking place and hasn't spoken to an officer, they are urged to call police on 01474 366 149 quoting 30-1219.
Alternatively call the independent charity Crimestoppers anonymously on 0800 555 111 or complete the online form at www.crimestoppers-uk.org.