No one was injured in the attack but the window of the bus was partially damaged.
Nongtnger said prompt action was taken by the district police and the fire-fighters were escorted to their guest house.
Chief Fire Officer of Odisha Fire Services, Sukanta Sethi, rubbished media reports that his men were assaulted.
He said the fire-fighters on Friday resumed their rescue operations by pumping waters from the coal mines.
The stay-off-the-road protest was called by Confederation of Hynniewtrep Social Organisation, an umbrella of 14 organisations to protest the passage of the Citizenship Amendment Bill in the Lok Sabha.
Meanwhile, the rescuers continued dewatering the abandoned flooded coal mines in their mission to evacuate the trapped miners.
Coal India Ltd, Kirloskar Brothers Ltd and Odisha Fire Service have been draining out water for over two weeks.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)