The decision resulted in chaos inside the house.
The counting of votes to a key election in the Delhi Civic Body resulted in a hand-to-hand fight between the Aam Aadmi Party and the BJP.
The BJP objected to one vote being made invalid. The Mayor insisted the result of the Standing Committee election, which is understood to be the most powerful body in the Municipal Corporation of Delhi, will be declared without the invalid vote.
The decision resulted in a street fight inside the house, with the elected councillors punching, and kicking each other.
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Standing Committee election called off after brawl between Aam Aadmi Party and the BJP.
During the brawl, Aam Admi Party (AAP) Councillor Ashok Kumar Maanu had collapsed at Delhi Civic Centre alleged that the ruckus had been caused by the BJP goons.
While talking to ANI, Maanu said, "They are so shameless that they attacked even women and the Mayor. BJP goons did this."
"You're Not In Your Senses": BJP Councillors On Mayor's Decision
After she declared one vote invalid, Ms Oberoi came under the firing line of angry BJP councillors, who shouted "you are not in your senses" at her.
Some BJP councillors shouted "Jai Shri Ram" and praised Prime Minister Narendra Modi.
Earlier, members of the ruling AAP and the BJP climbed on tables and shouted slogans against each other in the Municipal Corporation of Delhi (MCD) house.
"When They Realized They Lost, They (BJP) Attacked A Woman": AAP MLA
"As soon as BJP realized it is losing the Standing Committee election, it attacked our Mayor. Shelly Oberoi had to run out of the House to save herself. BJP's male councilors physically attacked her. BJP should admit defeat. When they realized they lost, they attacked a woman Mayor," AAP MLA Atishi said.
The drama started on Wednesday when Delhi's new Mayor Shelly Oberoi alleged that she was attacked by BJP councillors while conducting the election.
The house fell into chaos - councillors from both sides punched, kicked, slapped and pushed one another amid shouting. Some councillors were seen with their kurtas torn. One of them also collapsed.