Middle East crisis live: US to take ‘all necessary action’ to defend troops after three killed in drone attack

The US defence secretary, Lloyd Austin, has vowed the US will take “all necessary actions” to defend its troops after three servicemen were killed and dozens injured following a drone attack by Iran-backed militants on a US service base on the border of Jordan and Syria.

“Let me start with my outrage and sorrow (for) the deaths of three brave US troops in Jordan and for the other troops…