The incident, which sent shock waves across the state capital, occurred around noon when the three persons were preparing to replenish an ATM of a private bank in Babuganj locality in Hasangaj area close to Lucknow University campus, they said.
The deceased were identified as Anil Singh (40), Arun Kumar (45) and Avinash Shukla (35).
While two of them died on the spot, another was rushed to hospital, where he died during treatment. The assailants then fled with the cash. The exact amount  was being calculated, Senior Superintendent of Police (SSP) Yashasvi Yadav said.
He said police swung into action immediately after the incident and constituted 16 teams to track down the culprits. "We have taken the incident as a challenge and formed 16 teams to work on different angles to crack the case. Some valuable camera feed have been obtained. We are working on it," he said.
Yadav rushed to the spot with DIG R K Chaturvedi and other senior officers. Gory pictures of the three bullet riddled bodies went viral on news channels which also showed one of them lying inside the ATM in a pool of blood with wads of currency notes in the denomination of Rs 500 lying next to him.

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