Hundreds of Iraqi troops battling for control of the vital Baiji oil refinery are outnumbered, surrounded and remain trapped inside the facility, a U.S. official told ABC News. The battle for the refinery was in its fifth day today, although fighters for the radical Islamic militia ISIS have apparently taken control of much of the facility and are willing to keep the government forces isolated until they run out of food and ammunition, sources said. [....] Both sides have claimed to be in control of the facility, but witnesses have reported that ISIS has hung its black banners from the...