An oil tanker exploded at a Wisconsin refinery near Superior on Thursday, injuring at least five people. No fatalities have been reported so far. Eyewitnesses described hearing a huge blast shortly after 10:00 local time (16:00 GMT). Plumes of black smoke can be seen rising from the Husky Energy oil refinery. Several fire engines and ambulances were called to the scene. Police have advised... Еще residents to avoid the area. Wisconsin’s only refinery produces about 50,000 barrels of crude oil per day from North Dakota oil fields and Alberta’s tar sands.