Beyond the C.I.A. drone strikes, the war in the region is escalating in other ways. In recent days, American military helicopters have launched three airstrikes into Pakistan that military officials estimate killed more than 50 people suspected of being members of the militant group known as the Haqqani network, which is responsible for a spate of deadly attacks against American troops.
Such air raids by the military remain rare, and officials in Kabul said Monday that the helicopters entered Pakistani airspace on only one of the three raids, and acted in self-defense after militants fired rockets at an allied base just across the border in Afghanistan.Pakistani officials have angrily criticized the helicopter attacks, saying that NATO’s mandate in Afghanistan does not extend across the border in Pakistan.
As evidence of the growing frustration of American officials, Gen. David H. Petraeus, the top American commander in Afghanistan, has recently issued veiled warnings to top Pakistani commanders that the United States could launch unilateral ground operations in the tribal areas should Pakistan refuse to dismantle the militant networks in North Waziristan, according to American officials.
Special Operations commanders have also been updating plans for cross-border raids, which would require approval from President Obama. For now, officials said, it remains unlikely that the United States would make good on such threats to send American troops over the border, given the potential blowback inside Pakistan, an ally.
But that could change, they said, if Pakistan-based militants were successful in carrying out a terrorist attack on American soil. American and European intelligence officials in recent days have spoken publicly about growing evidence that militants may be planning a large-scale attack in Europe, and have bolstered security at a number of European airports and railway stations.
Homeland Security Secretary Janet Napolitano plans to discuss the current European terrorism intelligence with her European counterparts at a U.N. aviation security meeting this week in Montreal. “We are in constant contact with our colleagues abroad,” she told a Senate panel last week. “We are all seeing increased activity by a more diverse set of groups and a more diverse set of threats. That activity, much of which is Islamist in nature, is directed at the West generally.”