Travis Scott concert tragedy: Spiked drugs behind cases of cardiac arrest?

Houston Mayor Sylvester Turner has promised a "thorough review and investigation" of the tragedy at the Travis Scott-headlined Astroworld festival in the city, where eight people died and more than 300 were injured as crowds surged and stampeded during Scott's set, reports 'Variety'. 11 people suffered cardiac arrest at the show, Turner said, although causes of death, including the possibility of the use of spiked drugs, are under review.