Sixty-two people have been killed since Monday following the assassination of Raza Haider, a lawmaker in the Muttahida Quami Movement (MQM).
More than a dozen more people were killed overnight in Pakistan's Karachi, deepening fears of instability in the commercial hub after the killing of a member of the dominant political party in the city.
Sixty-two people have been killed since Monday, police and officials said, following the assassination of Raza Haider, a lawmaker in the Muttahida Quami Movement (MQM).
The government blamed Taliban insurgents, and the banned militant group Sipah-e-Sahaba Pakistan (SSP), for his killing.
Some analysts said violence could ultimately hurt the already struggling economy.
Karachi is home to the country's main port, the central bank and the stock exchange.
Those concerns are fuelled by the flight of Taliban militants to Karachi, a teeming city that is easy to hide in, after army offensives against their strongholds in the northwest.