A fourth crude oil storage tank caught fire and collapsed at Cuba's main oil terminal in Matanzas as flames spread from a tank that's been ablaze since Sunday. Only the blaze in the first tank has been contained in the country's most significant oil industry accident in decades. Huge columns of fire and thick black smoke bellowed all day, darkening the sky as far away as Havana. Explosions rocked the area just before midnight as one tank collapsed and again at noon as another imploded. One firefighter has died, and 16 people are reported missing. Cuba relies on oil to generate much of its electricity.