<span style="color: #222222;">The United States has urged its citizens to be vigilant against possible anti-American violence abroad following the killing of al-Qaeda leader Ayman al-Zawahiri. The State Department said, his death could prompt al-Qaeda supporters or other linked terror groups to target US facilities and personnel. It said, current information suggests that terrorist organisations continue to plan terrorist attacks against US interests in multiple regions across the globe.<br />''<br />''Zawahiri was killed by a US drone in the Afghan capital Kabul on Sunday. The killing was confirmed on Monday by US President Joe Biden. He said, Zawahiri had carved a trail of murder and violence against American citizens.</span><br />