The US Embassy in Beirut is concerned that militant groups may be planning attacks against Americans citizens and interests in Lebanon, an embassy statement said Thursday. The statement was the latest in a series of warden messages urging US citizens to be vigilant. It called on Americans visiting or living in Lebanon to "maintain a low profile in public" and avoid predictable behavior. "The US Embassy urges US citizens who live, work, or are traveling in Lebanon to exercise responsible security practices," it said. The statement comes amid sectarian tensions and a political deadlock in Lebanon. It also follows the deployment last week of US warships off the coast of Lebanon in a show of strength during a period of tensions with Syria, which the US blames for the impasse in Lebanon.