Al Qaeda's number two, Ayman al-Zawahiri, mourned two leading members of the terror network who were killed last month in Pakistan, in a video message posted Friday on the Internet. "I announce to you the good news of the martyrdom of my friend ... Sheikh Abu Khabab Al-Masri and his pious comrades," Zawahiri said in a videotape posted on a website used by militant groups. "With him also passed away ... our brother and educator, Ibrahim, who is the son of Sheikh Abi Al-Faraj Al-Masri, may Allah end his captivity," Zawahiri added in the brief message limited to the eulogy.The second-in-command to Osama Bin Laden, wearing a white tunic and matching turban, spoke in Arabic against the backdrop of photos of two bearded and turbaned men -- presumably the two Masris. Al Qaeda confirmed early this month that Abu Khabab al-Masri -- a top expert on chemical and biological weapons -- had been killed along with other "heroes" in late July. Pakistani officials said a July 28 missile strike in South Waziristan Agency killed Masri, an Egyptian militant. Local residents said the strike was carried out by a pilotless US drone.