Twenty-nine people were detained after they staged the protest infront of Indira Gandhi National Centre for Arts where Sindhi Academy organised the Sufi Festival, they said.
At around 7 pm, the protesters, who claimed to be members of Shiv Sena and Hindu Sena, staged the protest but were removed by police.
However, around 8:15 pm, when the Pakistani singer took the stage after an Indian singer Ghanshyam Waswani and a Kathak dancer performed, a group of protesters shouted slogans against Pakistan.
Police intervened and removed the protesters.