The British foreign secretary, Jeremy Hunt, warned this week of “the risk of a conflict happening by accident with an escalation that is unintended on either side.”
But fear of a standoff on a hair trigger does not seem to be prevalent on the streets of Baghdad.
“America and Iran are together, they both came here to fight Daesh,” he said using the Arabic term for the Islamic State,” said Adnan Sattar, 30, who works in the same store as Mr. Abu Hassan.
The mood was similar at a nearby barber shop, where Ali Selim was hanging his towels to dry on an outdoor rack and two friends were dozing in the afternoon heat inside.
“I am not worried, Iran and the United States, each one is afraid of the other,” Mr. Selim said. “There will be some mediators between Iran and America — maybe Europe.”
The parallels to 2003 do not escape anyone, but Mr. Selim’s comment pointed to one important difference: Then, important American allies like Britain, Canada and Japan supported the Bush administration in going to war; now, the Trump administration’s hostility to Iran is a far lonelier stance.
Last year, President Trump withdrew from the 2015 agreement under which Iran gave up parts of its nuclear program and froze others in return for relief from some economic sanctions. The president imposed new sanctions, his administration determined to squeeze Iran hard enough to force a change in government.