Iran began their World Cup campaign in Los Angeles on Monday with an opening match against New Zealand amid what the team described as an uncomfortable "tension".
There was a mixed reception in the stadium, as both boos and cheers could be heard.
Despite Fifa banning the Lion and Sun flag, the pre-revolutionary flag of Iran, some spectators displayed it during the match, and jeered and turned their backs on the field during the national anthem.
Outside the stadium, protesters gathered before the match, largely made up of Iranian Americans who oppose the government in Tehran.
Los Angeles is the biggest home to the Iranian community outside of Iran.
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