One of the accused -- Rajeev Kumar alias Bablu (45), had submitted fake documents, including the arms license to the company in which he worked as a gunman, posing himself as Jalim Singh, they said.
On March 30, Kumar fled with a van containing Rs 32.50 lakh cash near Peeragarhi Metro Station here, police said.
The vehicle belonged to Logicash Pvt Ltd. The firm deals in collection of cash from various institutions including NDPL offices, liquor shops etc and depositing it in the respective companies' accounts on a commission basis.
He had told one of the employees that his son studies in Thomson school in Mainpuri and told the firm's cashier and the complainant in the case - Vikash Kumar Sharma that his son's name is also Vikas, he said.
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Based on these two clues, the police team reached the Thomson School and started looking for students named Vikas. They found four students with that name and arrested arrested Kumar on April 3.
"After collecting cash from various destinations, at about 7 PM, they reached the office of Flipkart. The driver and the cashier went inside the premises and upon returning they found their vehicle missing along with the cash and gunman (Kumar)," DCP(Outer) MN Tiwari said.
In the company records, it was found that the accused is a resident of Etah district in UP.
His driving license was issued from Kanpur while his fake arms license had been issued from Etah.
During the visit to UP, police found that all the addresses given by Kumar to his employer were fake, he said.
Piecing together the clues, the accused was arrested from Mainpuri and Rs 25.13 lakh in cash and an LED TV purchased by him from the stolen amount were recovered, Tiwari said.
He disclosed that one Mukund Singh, a resident of Madipur was also involved in the robbery. Singh worked as a driver with the company and was on leave around the time of the incident.
He had given shelter to the gunman in Madipur on the night of the incident. He was also arrested on April 3 from there, the DCP said.
The heist was in planning for the last 5-6 months. Kumar Rajeev told police that worked at several banks and was looking for this opportunity from a long time.