The shooting at Centennial High School in Centennial occurred just after 9 p.m. . Fabian ##i saw a man armed with a shotgun , running military - style . ` ` We were shaking . Later , SWAT officers came to the classroom door . We were scared , '' 9th - grader Whitney Riley said . Eric Waugh and his friends thought initially it was an explosion in a chemistry class .
The shooting at Centennial High School in Centennial occurred just after 9 p.m. . Fabian ##i saw a man armed with a shotgun , running military - style . ` ` We were shaking . We were scared , '' 9th - grader Whitney Riley said . Eric Waugh and his friends thought initially it was an explosion in a chemistry class .