Anti-government protesters in Iran have been celebrating the national football team's elimination from the World Cup, following their 1-0 loss to the USA.

Videos showed people dancing in streets and honking car horns in Tehran and several other cities on Tuesday night.

Many Iranians refused to support their football team in Qatar, seeing it as a representation of the Islamic Republic.

State-affiliated media blamed hostile forces both inside and outside Iran for putting unfair pressure on the players.

The players did not sing the national anthem before their first game, a 6-2 defeat by England, in an apparent expression of solidarity with the protesters.

But they did sing at the Wales game, which they won 2-0, and at the politically-charged showdown against the USA.

Some protesters saw that as a betrayal of their cause even though there were reports that the team came under intense pressure from Iranian authorities.

The unrest started 10 weeks ago following the death in custody of Mahsa Amini, a 22-year-old woman arrested by morality police in Tehran for allegedly violating the strict rules requiring women to cover their hair with a hijab.

Authorities have responded to what they have portrayed as foreign-backed "riots" with a violent crackdown in which human rights activists say at least 450 people have been killed, including 60 children. More than 18,000 others are reported to have been arrested.

A video posted online on Tuesday night appeared to show dozens of people celebrating the Iranian football team's loss at a square in Mahsa Amini's home city of Saqqez, in the country's north-west. They can be heard cheering and waving headscarves before fireworks are set off.