On October 1, the police were informed about the killing at D R Polymers Godown in Tikri Kalan area of Mundka.
The body of the guard, Bajrang, was found tied to a cot with ropes. Later, when the godown's owner inspected the warehouse, he found several sacks of plastic granules missing, the police said.
The police scanned CCTV camera footages and questioned the workers employed with the company's warehouses at Tikri Kalan and Kirti Nagar.
During interrogation, Kumar confessed to the crime and revealed the names of his accomplices. Bajrang's cell phone was also recovered from him, they claimed.
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Kumar told police that the co-accused had left for IMT Manesar in Gurugram, Haryana, to sell their loot.
A raid was conducted at IMT Manesar where the other accused Raj Dev (36), Chotu (22), Jokhu Sahni (42), Nand Kishor (32) and Mangilal (26) were found unloading the robbed sacks of plastic granules, Deputy Commissioner of Police (Outer) Pankaj Singh said.
During interrogation, they revealed that these granules were imported and there was a high demand for them here, the police said, adding that after Hurricane Harvey hit the US, there was a decline in the products production and their demand had gone up here.
Police recovered 201 robbed sacks of plastic granules worth Rs 8,76,200.
During interrogation, the accused persons revealed that they were good friends and they had planned the robbery, the police said.
"They also disclosed that Bajrang was obstructing them from committing the dacoity and hence they tied him to a cot and killed him as they feared that he would later identify them," the DCP said.
They decided to sell their loot in Gurugram assuming the police were not suspecting, the officer said.