Officials aren't saying which militants, if any, Faisal Shahzad may have met in Pakistan, but focus is intensifying on how interlinked Pakistan militants groups may be. Pakistan and US officials differ in their assessments.
The Pakistan Taliban may have sought to scare the military from launching an offensive against their base in South Waziristan. But the attacks, which killed 112 people in the past week, could harden the Army's resolve.
In a brash response to the government's claim he was dead, Pakistan Taliban chief Hakimullah Mehsud appeared in a video broadcast Monday.
Villagers in northwestern Dir have 250 militants under siege, but say they need help from security forces to prevail. The military has a poor record of aiding these volunteer militias.
As the government prepares for a major operation in South Waziristan, it's eyeing lessons learned from previous campaigns that were cut short in the face of weak public support.
Qari Zainuddin, who had been challenging militant chief and fellow tribesman Baitullah Mehsud, was shot dead Tuesday.
As the Army begins attacking South Waziristan, it has targeted hideouts of Baitullah Mehsud. Killing or even dislodging the militant chief could deal a severe blow to the movement, analysts say.
Religious charities with extremist ties or sympathies are winning favor among displaced people for their speedy aid work.
A suicide attack on Peshawar's Pearl Continental, popular among foreigners, killed at least five people and wounded 70.
A new militia is targeting militants in revenge for a mosque bombing Friday. Some say it could be a turning of the tide in public sentiment, driven by recent Army successes.