US issues 'worldwide caution' alert after Ayman al-Zawahiri's death

The US State Department has issued a worldwide alert after the death of Al-Qaeda chief Ayman al-Zawahiri. On August 1st, President Joe Biden announced that the most wanted terroriast Ayman al-Zawahiri was killed in a drone strike in Kabul and added that "Justice has been delivered." Zawahiri, one of the world's most wanted terrorists and a mastermind of the September 11, 2001 attacks, was killed in a drone strike carried out by the US in the Afghan capital Kabul on Saturday.