WASHINGTON (Reuters) - China has unexpectedly denied the USS Kitty Hawk aircraft carrier and its accompanying ships entry to Hong Kong port for a long-planned Thanksgiving holiday visit, the U.S. State Department said on Wednesday. "At present, it appears the USS Kitty Hawk strike group will not be making a port call in Hong Kong as previously planned as a result of a last minute denial by the Chinese Ministry of Foreign Affairs," State Department spokeswoman Nicole Thompson said. China gave no reason was for the denial, Thompson said. The United States is pressing Chinese authorities for an explanation and...