PESHAWAR, Pakistan (Reuters) - Senior Al Qaeda commander Abu Saeed al-Masri was killed in recent clashes with Pakistani forces near the Afghan border, a security official said on Tuesday. "He was believed to be among the top leadership of al Qaeda," the senior security official said on condition of anonymity. Al-Masri, which means "the Egyptian," was the most senior al Qaeda operative to have been killed in Pakistan's tribal belt since the death of his compatriot, Abu Khabab al-Masri, an Qaeda chemical and biological weapons expert, last month. Television channels identified the dead man as Mustafa Abu al-Yazid and said...