Hundreds of Pakistani investors rioted at the Karachi Stock Exchange Thursday demanding a halt in trading after share prices fell for the 15th straight session.

The exchange's security chief Mohammed Aslam said investors began smashing windows after the administration declined to suspend trading.

Similar protests also broke out in Lahore, where investors burned tires and blocked roads.

The Karachi Stock Exchange index has fallen 14 percent since Monday.  Angry investors blamed the government for the recent volatility, after regulators relaxed curbs on daily stock price movements.

Persistent concerns about economic and political instability have also contributed to a decline in Pakistani stocks.

Some information for this report was provided by AFP, AP and Reuters.