Majority Of IEDs Are Traced To Pakistan -- USA Today
WASHINGTON – Pakistan is the source of explosives in the vast majority of makeshift bombs insurgents in Afghanistan planted this summer to attack U.S. troops, according to U.S. military commanders.
From June through August, U.S. troops detected or were hit by 5,088 improvised explosive devices (IEDs), the most for any three-month period since the war began in 2001.
Those bombs killed 63 troops and wounded 1,234, Defense Department records show.
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Update #1: U.S. military tracing majority of IED chemicals to Pakistan -- Stars and Stripes
Update #2: As Afghan IEDs Soar, US Commanders Blame Pakistan -- Antiwar.com
Update #3: The Decline Of The IED-- Strategy Page
My Comment: And these weapons are terribly effective.