President Donald Trump said Thursday that Iran has made a "very big mistake" by shooting down a US spy drone, an incident that is likely to further escalate already soaring tensions between Washington and Tehran.
White House press secretary Sarah Sanders said Trump was briefed Wednesday night and again Thursday morning about the incident.
Later, President Trump tweeted: "Iran made a very big mistake!"
Trump’s tweet came as his national security officials were huddling to weigh possible responses, CNN reported.
On Monday, the US defence department said it was deploying 1,000 extra troops to the region in response to "hostile behaviour" by Iranian forces. It has already sent an aircraft carrier strike group and B-52 bombers.
The US has also accused Iran of attacking two oil tankers with mines last Thursday just outside the Strait of Hormuz, in the Gulf of Oman. Iran rejects the allegation.
It was the second time in a month tankers had been attacked close in the region, through which a fifth of the world’s oil passes each day.
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