Ayatollah Ali Khamenei, Iran's supreme leader, has tweeted a graphic that appears to depict US President Barack Obama holding a gun to his head.
The tweet reads, "US president has said he could knock out Iran's military. We welcome no war, nor do we initiate any war, but if any war happens, the one who will emerge loser will be the aggressive and criminal US."
According to USA Today, the account has not been verified by Twitter but is widely believed to be the supreme leader's.
The tweet came just three days after the United Nations Security Council, lead by New Zealand, agreed sanctions levelled against Tehran will be dismantled in exchange for restrictions on its nuclear program.
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It's Khamenei's second tweet on the subject.
On July 17, he posted another message: "US pres. said he could knock out Iran's army. Of course we neither welcome, nor begin war, but in case of war, US will leave it disgraced."