DOHA, Qatar (CNN) -- A U.S. Central Command spokesman said Thursday that "we may never know" precisely what happened at a Baghdad marketplace, but the destruction seen on Iraqi television probably was not caused by a coalition bomb. Iraqi officials said 15 people were killed in the Shaab district when a U.S. missile struck the market. "We think it's entirely possible that this may have been in fact an Iraqi missile that either went up and came down, or given the behaviors of the regime lately, it may have been a deliberate attack inside of town," said Brig. Gen. Vincent...