However, contrary to what was claimed, the preliminary probe by police indicted that the incident may have taken place earlier and not on last Friday.
"This is a serious matter. The guilty won't be spared," Fadnavis told PTI this evening.
The initial probe however suggested that the video is an old one, DCP (Detection 1) Mohan Dahikar said.
The girl's name has been withheld and her statement will be recorded by the police, informed Dahikar, saying that the probe by the zonal DCP is on.
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"We have called for a report from the police within 48 hours. In these 48 hours, we will also ensure that action is taken if anybody is found to be guilty. This is a very serious incident and we will ensure that no person who is guilty of manhandling is spared," Fadnavis said earlier in the day.
Lalbaugcha Raja Ganesh pandal in central Mumbai attracts lakhs of devotees during the 10-day Ganesh festival which ended yesterday.