Officials: Al Qaeda's Mad Scientist Killed One of al Qaeda's top chemical and biological weapons experts was killed in an air strike by a CIA pilotless drone in a remote Pakistani border region, senior Pakistani intelligence officials told CBS News Tuesday morning. Intelligence officials investigating the Sunday night missile attack confirmed that Midhat Mursi al-Sayid Umar, also known as Abu Khabab al-Masri was one of six men killed and his remains had been positively identified. "We now have a positive ID on the body. I can confirm to you that Al-Masri has been killed,"