Protesters attacked what they deemed to be US' disproportionate response -- the killing of 24 militiamen on Sunday in retaliation for the death of an American contractor on Friday.
President Joe Biden and other top US leaders had been warning for days that America would strike back at the militias, and they made it clear it wouldn't be just one hit but a "tiered response" over time.
Thousands of mourners on Saturday joined the formal funeral procession for Iranian Major-General Qassem Soleimani, the head of Islamic Revolutionary Guard Corps' Quds Force, who was killed a day before near Baghdad's international airport in an air strike ordered by United States President Donald Trump.