The US is considering its response to the first deadly strike on its forces in the Middle East since the Gaza war began. 

Three US servicemen were killed and at least 34 wounded in a drone attack by Iran-backed militants in northeastern Jordan near the Syrian border, an escalation in the violence that has erupted beyond Gaza. 

President Joe Biden has ordered retaliatory attacks on Iranian-backed groups. 

US Correspondent Richard Arnold told Mike Hosking that the Pentagon is reviewing how the attack drone was able to get through American defences. 

He said that the Secretary of State said that Biden is walking a fine line between an effective response and widening the war in the Middle East. 

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