The accused had been stalking the victim for four or five days and molested her when she was returning home after celebrating New Year, Bengaluru Police Commissioner Praveen Sood told reporters here, amid growing public anger over delay in nabbing the culprits.
Sood said two other accomplices had been identified and they would be arrested soon.
"This is a plan prepared by six of them. One of them groped. Others assisted," the Police Commissioner said.
Aiyappa and Sudesh are delivery boys, Leno was a helper and Somashekhar a driver, Sood said, adding, a bike had been seized from them. "They have confessed (to the crime)," he said.
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The arrest comes three days after a CCTV footage surfaced showing two scooter-borne two men accost a woman, zoom past her, take a U-turn and halt the vehicle before one of them jumps off, gropes her and escapes even as bystanders watch without coming to her help.
He said Prashant Francis, a resident of Kammanahalli, came forward with the "gory" video to help police.
Sood said "when we saw the video I felt that I don't have to talk to the victim at all. It was a clear case of molestation and groping and maybe much more. We did not wait, we did not waste time to look forthe victim or contact her."
"We suo motU registered the casebecause what had been shown on the video convinced us beyond all possible doubt that this was a heinous crime."
In the footage, one of the two men is first seen approaching the woman, forcing himself on her and dragging her to the scooter while the other person is seated on it, before pinning her down.
As she resists and tries to free herself, he pushes her down on the road and both escape from the scene, but not before the victim slaps the one who had grabbed her.
The incident at Kammanahalli here had occurred even as on late December 31 night, several women were molested and groped and lewd remarks passed by miscreants on M G Road and Brigade Road, despite the presence of 1,500 police personnel to control the unruly New Year revellers.
About the M G Road-Brigade case, the Bengaluru Police Commissioner said police had not found any sign of molestation.
"The whole team was looking for molestation in the videos, which were released by ourselves (police). We could not find any sign of molestation," he said.
Sood said police had nothing to state about the January 2 incident because it was looking at video footage to find out if any such molestation incident at MG Road had taken place.
He added that police had filed four suo motu cases against the culprits after coming to know of them through social media and newspaper reports, where the alleged victims posted their narrative of being molested during New Year's celebrations.
"We are asking newspaper managements to cooperate with us so that justice can be given to these women. Investigation and giving justice to women is our joint responsibility," he added.
Sood said justice cannot be delivered by just making statements, but by participating in the investigation and bringing the guilty to book.
"Justice can be done only if they (victims) participate in the investigation and the guilty has been brought to book. The purpose of filing FIR is to bring the guilty to criminal justice," the Commissioner said.