Around 20 activists of the local Sena outfit first tore apart a large banner near the Shahibaug under-bridge and also defaced another banner with black colour at RTO circle, local Shiv Sena leader Jitu Solanki said.
"Pakistani singers are making money when Indian soldiers and citizens are getting killed by Pakistan-backed terrorists," he alleged.
"One one side, Pakistan sponsored terrorists are taking lives of innocent Indians, while on the other hand, these Pakistani singers are coming here to make money.
Solanki warned that the workers will stage protest against Khan when he lands in the city for the concert.
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"We will also stage protests against Khan when he lands in the city for the concert. Today's protests were just a warning, as we may go to extremes to stop him from performing in the city," Solanki, who was leading the workers, said.
Though there is no official word from the organisers after today's developments, but a ticket booking clerk told PTI that several vendors associated with the event are calling up the office out of anxiety.
Earlier on April 22, Shiv Sena members staged protests against Pakistani singer Ghulam Ali, who came to collect an award at Mahuva town of Bhavnagar district.
No police complaint has been filed in this regard so far.