Was A Sonic Weapon Used On Student Protesters In Serbia?

Student demonstrators who gathered in Belgrade on March 15 were panicked by a loud, strange sound some described as "creepy." The audio blast, which sent them scrambling for cover, has stirred speculation: A forensic analysis suggests it could have been a Vortex weapon fired from a point near the protesters. Serbian President Aleksandar Vucic has said, "There is no sound cannon in the Serbian Army."