Kuwait has beefed up security around vital oil and other installations after the latest al Qaeda threat to attack oil facilities in Gulf Arab states, security sources told Reuters on Thursday. "A directive was issued by the Interior Ministry late on Wednesday to security officials to beef up security around oil facilities, vital installations and diplomatic missions," the sources said. In an Internet video posted on Wednesday, al Qaeda deputy leader Ayman al-Zawahri urged militants to strike oil targets in Muslim countries. The comments were said by Arabic television station Al Jazeera to be previously unaired parts of an interview it broadcast in September.