Assembly Speaker Haribhau Bagde rejected NCP group leader Jayant Patil's adjournment motion on the issue.
Patil targeted Fadnavis, who also heads Home department, for the delay in Pandey's arrest. Opposition leader Radhakrishna Vikhe-Patil also criticised the government on the issue.
An FIR was registered last evening at Versova police station on the basis of complaint of the woman who alleged that Pandey harassed her by posing to her obscene questions and passing lewd remarks inside a hotel room in Mathura on March 4 during the BJYM's three-day executive committee meeting.
"Immediately after BJP Mumbai president Ashish Shelar received a complaint in this regard, he suspended Pandey and disbanded the entire Mumbai Yuva Morcha unit.
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"Shelar had also asked the woman to file a police complaint, but as she was reluctant, I asked the Women Commission to probe the matter," Fadnavis said.
He said the complainant lodged a police complaint yesterday and accordingly an FIR was registered.
"There was no question of sparing anyone who is found guilty," he added.
In her written complaint to BJP city unit president Ashish Shelar, the woman had stated that Pandey also "held her hand" when she tried to leave the room.