KARABILA, Iraq (CNN) -- The joint U.S.-Iraqi Operation Spear continued Saturday as Marines, sailors and Iraqi security forces fought insurgents in Karabila, near the Syrian border. The most intense fighting was concentrated in the center of town, where enemy fighters were holed up in a bunker complex. Marines also found four people who appeared to have been taken captive and beaten. Jane Arraf, CNN's senior Baghdad correspondent, is embedded with U.S. troops taking part in the mission. She spoke with CNN anchor Betty Nguyen by phone during the pitched battle. ARRAF: What I see in front of me is absolutely...