The United States has warned military and commercial vessels plying the coast of Yemen that they may be targeted by Al-Qaeda. A special advisory by the US Office of Naval Intelligence on its webdiste said information suggests that Al-Qaeda remains interested in maritime attacks in the Bab-al-Mandeb Strait, Red Sea, and the Gulf of Aden along the coast of Yemen. <br/><br/>The advisory said although it was unclear how the attacks would occur, it may be similar in nature to the attacks against the USS Cole in October 2000 and the M/V Limburg in October 2002 where a small to mid-size boat laden with explosives was detonated. <br/><br/>It cautioned about other, more sophisticated methods of attack, including missiles or projectiles. The advisory urged all vessels transiting the waters in the vicintity of Yemen to operate at a heightened state of readiness, maintain strict 24-hour visual and radar watches.