The United States has issued two new travel warnings for Yemen and Uzbekistan because of possible terrorism. A new State Department warning Friday says the threat to U.S. citizens in Yemen is high because of terrorist activities. It says U.S. officials are concerned about possible attacks by extremists against Americans or U.S. interests there. It urges Americans to put off any non-essential travel to Yemen. The State Department also says it has information that terrorists may be planning to attack U.S. interests in Uzbekistan in the near future. It says terror groups including al-Qaida and Islamic Jihad are active in the region. US authorities in March issued a worldwide caution to Americans planning to travel overseas because of what it calls the threat of terrorism and anti-American violence.