On January 6, a man's mobile phone was allegedly stolen whil he was in front of the jaguar den at the zoo. As soon as he realised about his loss, he raised an alarm, they said.
Kumar belongs to Ranchi but has been staying in north Delhi's Azadpur, the police said.
Along with his friend Roshan, Kumar would come to the Delhi zoo from Azadpur on weekends and holidays to steal as many phones as he could, Chinmoy Biswal, deputy commissioner of police (Southeast), said.
On the day Kumar was caught, his accomplice was also there, but managed to escape, he said.
Kumar also revealed that the duo would also be active during the days when Pragati Maidan used to host melas or expos, the official said.
The accused duo used to position themselves around the white tiger or jaguar den where a lot of people would gather to see the animals, the official said.
They did not steal on roads, buses or elsewhere, but only targeted high footfall places like zoo or Pragati Maidan where people were unmindful of their personal belongings, he said.
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