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Pakistani Taliban claimed responsibility.
Nuclear-armed
The violence combined with political uncertainty has helped undermine investor confidence and send the country's financial markets on a downward spiral.
"There were bodies lying everywhere and wounded people soaked in blood were screaming for help," said Shah, the manager of a petrol station near the industrial complex in Wah, 30 km (20 miles) northwest of Islamabad.
"Many of the wounded were either without legs or hands. I could see body parts hanging on trees," he said.
A Pakistani Taliban spokesman said the blasts were retaliation for military operations against militants in the northwestern region of Bajaur, on the Afghan border.
"If it doesn't stop we will continue such attacks," Taliban spokesman Maulvi Omar said by telephone.
"The Wah factory is a killer factory where arms are being produced to kill our women and children," he said.
A hospital official said 59 people had been killed and 81 wounded in the blasts near the heavily guarded complex, the hub of Pakistan's defense industry where about 25,000 workers produce explosives, ordnance and weapons in about 15 factories.
Hundreds of workers were milling about outside the complex at the end of their shift when the bombers struck.
GOVERNMENT VOW
One of the bombers blew himself up outside the complex's main gate while the second detonated his explosives at almost the same time near another gate, said police officer Sardar Shahbaz.
Soldiers cordoned off the area and kept reporters back as ambulances arrived to take away casualties, a witness said.
Pakistani Taliban said last week they were behind a bomb attack on an air force bus in the city of
Since July last year,
Violence subsided when a coalition government that came to power after a February election opened talks with militants but it picked up again after their top leader, Baitullah Mehsud, suspended the talks in June.
This week's resignation of President Pervez Musharraf, under threat of impeachment from the ruling coalition, has raised questions about the government's commitment to tackle violence.
Although Musharraf's support for the U.S.-led war on terrorism was deeply unpopular, the government has vowed to keep up efforts to fight the militants.
But the first days since Musharraf's departure have seen squabbling among the ruling parties, raising concern about the government's ability to deal with security and economic problems and bring political stability.
Share and currency markets have dropped in the last two days after initial gains on Musharraf's exit.