By Tom Vanden Brook, USA TODAY
Updated 15h 47m ago

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.

By Johannes Eisele, AFP/Getty Images

The U.S. military is working to beef up security against IEDs.

By Johannes Eisele, AFP/Getty Images

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.
STORY: Pentagon expects IED hits to rise
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More than 80% of the IEDs are homemade explosives using calcium ammonium nitrate fertilizer produced in Pakistan, said Navy Capt. Douglas Borrebach, deputy director for resources and requirements at the Pentagon's Joint IED Defeat Organization.

"The border is a sieve," Borrebach said. "You can do your checkpoints, but that's not going to help stem the supply."

The military is working with the State Department, other U.S. agencies and Pakistan's government to prevent fertilizer from reaching the insurgents' bomb factories.
Bomb casualties

U.S. troop casualties from improvised explosive devices in Afghanistan*:

* June through August; Source: U.S. Defense Department

The U.S. government increasingly has been blaming Pakistan for failing to corral insurgents. Two weeks ago, Adm. Michael Mullen, then the chairman of the Joint Chiefs of Staff, said the Haqqani terror network linked to attacks in Afghanistan had ties to Pakistan's spy agency.

A Senate bill includes funds to train border guards and customs officials in Pakistan and Afghanistan. It also supports agricultural extension programs that encourage Pakistani farmers to use alternative fertilizers.

Sen. Robert Casey, D-Pa., met with top civilian and military leaders in Pakistan in August to urge them to stop the flow of bomb-making materials into Afghanistan. They promised to help, but did not reveal a sense of urgency, Casey told USA TODAY after the trip.
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