Iran has denied involvement in a drone attack on a US base near Jordan's border with Syria that killed three US troops. The US blamed the attack on "radical Iranian-backed militant groups" which also left dozens injured. US President Biden vowed revenge and said: "We shall respond." It is the first time that a strike has killed US troops in the region since Hamas's 7 October attack on Israel. There have been other attacks on US bases in the region‚ but before Sunday there were no...