Did major renovations contribute to ferry's capsizing?

What caused the South Korean ferry to sink?

That's the question authorities are trying to answer. One contributing factor could involve the ship's weight.

According to one report today, major renovations were made to the ferry recently - adding more rooms and increasing its weight by over 180 tons.

CNN's Tom Foreman has more on the renovations and whether it could have been a contributing factor to the shipwreck.