In Yemen, a US drone strike has killed 13 suspected Islamic State group militants in the central Bayda province today. <br/><br/>Security sources said in Aden today that it was the second US strike against IS in Yemen. The first came just over a week ago, when the US military said it had killed dozens of jihadists at IS training camps in the same province.<br/>'<br/>The United States is the only country known to operate armed drones over Yemen, but its previous known strikes have targeted Al-Qaeda. <br/><br/>Washington has intensified its drone war against Yemen- based jihadists since US President Donald Trump took power in January.<br/>