On a tip off, the gangsters were traced to a hideout and surrounded by the police teams early this morning.
On being cornered, the gangsters fired several rounds at the police parties before committing suicide, Faridkot SSP, Nanak Singh told PTI over phone.
He said gangsters Bunty Dhillon and Jaspreet Singh alias Jumpy of Faridkot district and Nishan Singh committed suicide.
"While Bunty and Jaspreet died on the spot, Nishan Singh was declared brought dead in a hospital," Singh said.
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Sirsa SP, Satender Kumar Gupta said the Haryana police team coordinated with their Punjab counterparts in the entire operation.
Nanak Singh said Bunty and Jaspreet were dreaded gangsters of the Devinder shooter gang.
Their involvement with the Vicky Gounder gang lately also came to the fore, he said, adding the trio had multiple FIRs registered against them in various police stations.
They were also involved in a shootout incident at Poanta Sahib and Tarn Taran, besides in many murder cases, and many other heinous crimes.