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In December 2009, an al Qaeda double agent blew himself up at a CIA base in eastern Khost province, killing seven CIA employees. The attacker, a Jordanian man named Humam al-Balawi, was brought into the base because he claimed to be able to reach high-level al Qaeda leaders.

Meanwhile, political tensions between Afghanistan and Pakistan continued to mount Monday. The Afghan Foreign Ministry warned that relations with its neighbor will suffer if cross-border artillery attacks hitting eastern Afghanistan continue.

The Afghan government has said an unknown number of Afghan civilians have been killed by the shelling coming from Pakistani territory in recent days. The attacks allegedly have destroyed several houses and mosques and displaced hundreds of people.

The Foreign Ministry quoted Mohammad Sadeq, Pakistan’s ambassador in Kabul, as saying that the attacks were not intentional and that he regretted the killings and the destruction of property.

The Afghan censure comes as U.S. officials have sharpened their missives to Pakistan over the past week, drawing more direct lines between the government and the Haqqani network, which is affiliated with the Taliban and al Qaeda and often is blamed for attacks in Kabul.

NATO said Monday that its operations in the east in the past four months have killed more than 450 enemy fighters but that it is believes the Haqqanis, who control large areas in the east, still are operating out of Pakistan.

“We have no credible intelligence indicating that the Haqqani network has eliminated their operating safe havens in Pakistan,” said German Brig. Gen. Carsten Jacobson, a spokesman for NATO forces in Afghanistan. “They continue to plan and execute operations from across the border.”

In the south on Monday, a NATO service member was killed in a bomb attack, pushing to 38 the number of international troopers killed this month.

Associated Press writer Adam Goldman in Washington contributed to this report.