Among those killed was one of 25 Al-Qaeda operatives listed late yesterday by the Yemeni authorities as among those plotting attacks to coincide with the ending of the Muslim holy fasting month of Ramadan later this week, the source told AFP.
The raid in Yemen's eastern Marib province targeted their vehicle "and turned it into a ball of fire, immediately killing the four militants," the source said, adding that all those killed were Yemenis.
The tribal source named two of the dead as Saleh al-Tays al-Waeli and Saleh Ali Guti.
Waeli figures on a government list of 25 Al-Qaeda suspects wanted in connection with an alleged plot to launch a major attack before Ramadan ends and the Eid al-Fitr feast begins, either Thursday of Friday.
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About two dozen US diplomatic posts have been shuttered across the Middle East since Sunday after Washington said electronic intercepts of high-ranking Al-Qaeda operatives signalled a major attack was imminent.
US media said today that intercepts between Al-Qaeda chief Ayman Al-Zawahiri and the leader of the group's Yemen affiliate had sparked the closures as well as a global travel alert.
Today's drone strike is the fourth of its kind since July 28. The raids have killed 17 suspects in one week.