The first incident happened at around 1.30 PM when over ten motorbike-borne men came near an under-construction apartment at Bibirbagan area and attacked a person named Shiekh Aslam, a senior police officer said.
As they opened fire, two bullets hit Aslam's left leg, the officer said adding a few bombs were also hurled by the bike-borne gang at another gang, who on hearing the sound of firing, rushed to the place.
Within an hour, the attackers' rival gang, allegedly controlled by injured Aslam, tried to shoot one Samshad Ali when he was fetching water from a pond in Motijheel area, a mere 200 metre away from the Bibibagan spot.
Both Ali, who sustained bullet injury in his left shoulder, and Aslam were being treated at the N R S Hospital and police stated condition of both of them were "stable".
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According to them all the persons including Aslam, Ali and one of the alleged attackers Niwajuddin, have "serious" criminal antecedents.
The gangsters are allegedly involved in a racket selling a single flat to different customers, the police officer said.
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Meanwhile, in a joint operation the Anti-Rowdy Squad and Entally police station teams arrested one person from the locality late at night, a senior police officer said.
"Most of the people involved in the clash have past criminal records. Their whereabouts are recorded in local police stations and they will be nabbed," the IPS officer said.