According to police, Anu and her husband Rajesh run a jewellery shop on the ground floor and live on the first floor of their Manas Kunj flat in the area.
"Last night, when Rajesh was about to close the shop around 10.30 pm, three bike-borne armed assailants barged into the shop. While one of them trained a pistol on Rajesh, the other two started robbing the shop," a police officer said.
She immediately raised an alarm after which her neighbours gathered at the spot. Fearing to be caught by the public, the assailants tried to flee from the spot.
Hearing the noise, a patrolling Delhi Police constable, identified as Shishpal, rushed to the spot and with the help of neighbours nabbed one of the assailants.
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The accused was identified as Arvind, a resident of Uttam Nagar, police said, adding that the two absconding robbers have also been identified at the instance of Arvind.
Applauding the brave act, police said that Anu would be awarded along with the patrolling cop and locals who helped in nabbing the armed assailant.