<p>An explosion near the intersection of King Street West and Bay Street sent plumes of brown smoke billowing through Toronto’s business district on May 1.</p><p>The explosion was due to an overheated hydro vault, CBC News reported, citing Toronto Fire Services. The vault was filled with high-voltage transformers, and smoke erupted from grates along the street when the vault exploded.</p><p>The smoke was contained and the surrounding area closed off by about 8 pm, according to a tweet</a> from Toronto Fire Services Chief Matthew Pegg. Platoon Chief Kevin Shaw told local reporters</a> that the explosion could have been caused by “dampness, water or an aging hydro vault,” and that authorities were investigating.</p><br />
