KARACHI: Power Supply to the president's camp office, Bilawal House, and adjoining areas was suspended after unknown miscreants attacked the Clifton grid station on Thursday night, disabling several feeders that served Boat Basin, Shirin Jinnah Colony and parts of the port area, private TV channels reported quoting KESC sources.

It was alleged that activists of some workers' unions also stopped people from entering the Bin Qasim power plants and tried to stop its operations.

The spokesperson for the Karachi Electric Supply Company was not available for an official version.

The alleged attacks came hours before a strike called for Friday by several political parties, trade union organisations and other groups.

The general secretary of the People's Workers Union denied that KESC's employees were indulging in such acts and alleged that the management, in connivance with those who were not supporting the workers' protest, were deliberately creating a crisis to blackmail the government into taking action against the labourers.

He alleged that the KESC management was incapable of defending its strategic installations and the government should take serious note of the absence of adequate security arrangements. He said the management had no sympathy for the people of Karachi.

Meanwhile, Sindh Governor Ishratul Ibad has ordered police and Rangers to take steps for the security of power installations and catch the elements involved in the attacks.