The senior al-Qaida leader known as Abu-Zaid al-Kuwaiti was killed by a US drone strike in Pakistan on Friday. US officials confirmed the news, NBC News reported. Experts said Sheik Khalid Bin Abdul Rehman Al-Hussainan was one of the top remaining leaders of al-Qaida following the death of Osama bin Laden and a possible successor to Ayman al-Zawahiri, bin Laden’s deputy and successor. Hussainan was the highest-ranking al-Qaida official to be killed by the United States since Anwar al-Awlaki in September 2011. Awlaki, a US citizen, died in a drone strike in Yemen.