Senior al-Qaeda leader Abu Yahya al-Libi was killed in Pakistan on Monday, a US official has told the BBC.
US officials said Libi was the target of a drone strike which hit a volatile tribal area of Pakistan's north-west, killing 15 suspected militants.
There has been no confirmation of his death from sources in Pakistan.
According to officials, he played a critical role in the group's planning against the West.
Marco Werman talks with former CIA analyst Jarret Brachman.