Four persons - cashier Manveer, security guard Pradeep, driver Adil and a custodian - were inside the van when the robbery happened.
Manveer and Pradeep were injured during the incident and were being treated a hospital, the police said.
A CCTV camera footage showed the four men following the van, they said, adding that an investigation was on to find out whether any insider was involved in the robbery.
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