KSE benchmark 100-share index was 2.05 percent, or 244.65 points, lower at 11712.25 on turnover of 58 million shares in afternoon trade.

The KSE-index has lost 2.8 percent since the killing of bin Laden. The index gained about 28 percent in 2010.

"There is concern that there may be delay of aid, especially from the IMF (International Monetary Fund) after news that visits of all missions have been cancelled," said Sajid Bhanji, director at brokers Arif Habib Ltd.

All missions of international financial institutions, including the IMF, World bank and Asian Development Bank had cancelled their visit to Pakistan on expected backlash from the killing of Osama bin Laden this week, according to a local media report.

The IMF declined to comment and no one was available at the Finance Ministry.