Around 100 protesters, headed by their state unit president Vikram Chowdhary, stopped the bus, which was carrying 30 passengers, for around half-an-hour and demanded immediate stoppage of the bus service to the neighbouring country, police said.
However, a heavy police force, led by SSP Manmohan Singh, rushed to the spot before the situation went out of control.
Around 25 activists of Youth Congress were rounded up before police released the bus and helped it continue its onward journey.
Pakistani troops attacked an Indian post along the Line of Control in the Poonch sector in Jammu and Kashmir on Tuesday, killing five soldiers.