The Karachi Stock Exchange's benchmark KSE-100 index shed 441.62 points, or 2.46 percent, to close at 17,522.56 with 173.03 million shares traded.
"There was a panic-like situation in the market as investors fear United States may impose economic sanctions on Pakistan because of the gas pipeline," analyst Mohammad Sohail of Topline Securities told AFP.
"The market experienced turmoil all the day, it never recovered till it suspended trading."
A consortium is to start work today on the gas pipeline despite American warnings of possible sanctions.
Pakistani President Asif Ali Zardari held talks last month in Tehran with Iranian counterpart Mahmoud Ahmadinejad and supreme leader Ayatollah Ali Khamenei, who urged Islamabad to press ahead with the project.
Zardari's spokesperson said the world should realise the project was being commissioned "purely to meet economic needs of the country".
Pakistani analysts said a statement from the US State Department was expected later in the evening, which could determine the future course of the market.
"The market's future trends depend on what the US State Department says in its next statement about the gas pipeline," Sohail said.
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@Tariq1: Agreed. At least someone here talks sense
@1984: I have been working tirelessly for last 8 years as an expat to bring foreign investors in energy sector. My dear, if the investors are willing to take the risk to come to Pakistan and then invest. Pakistan govt risk is zero. If the project is successful then good for the investors otherwise they pack and go home and in the meantime several million dollars will be spent here. Kindly note that these investors are not stupid and coming here for PICNIC. They have done their homework and will make good profits!
@Tariq1: Sorry to interrupt you....
But if Pakistan had gas and oil as you claim,your benefactors USA would have attacked you by this time to capture Osama Bin laden and install "democracy" in ur country.....
We have plenty of gas in our country and don't understand WHY WE ARE IGNORING OUR OWN RESOURCES. Thar has plenty of coal that consists of methane gas and water. Sindh Govt is ignoring this methane gas also know as Coal Bed Methane (CBM) development. Canadian & American investors are willing to work on CBM project. The USGS (US Geological Department) estimates 30 TCF potential and have stated clearly to our govt that they will team with Canadians & Americans in bringing latest technology in developing the CBM resource. The CBM will cost half that we would pay for Iranian gas or LPG. HOPE AND PRAY THAT THE NEW ELECTED GOVERNMENT LOOKS INTO OUR OWN NATURAL RESOURCES.