US warns of possible retaliation over death of al-Qaeda leader

US State Department has urged the citizens to be vigilant against possible anti-American violence abroad following the killing of al-Qaeda leader, Ayman al-Zawahiri.

It said his death could prompt al-Qaeda supporters or other linked terror groups to target US facilities and personnel.

The seventy-one-year-old Egyptian doctor, Zawahiri who took over al-Qaeda after the death of Osama Bin Laden in twenty-eleven was killed by a US drone in the Afghan capital, Kabul, on Sunday.

He had helped mastermind the September/eleven attacks on the US in which nearly three thousand people lost their lives.