There was no immediate report in Iranian state-run media on the incident near Azadi, or Freedom, Square in Tehran on Sunday night after a call went up for protests there
Amnesty said there had been dozens of deaths in the Tehran suburb of Shahriar, likely one of the areas with the highest toll of those killed in the unrest
The attack on the police station in the town of Qahderijan, in the central province of Isfahan, led to violence that claimed the lives of six protesters
Authorities restricted access to Iran's most popular social-media platform in response to one of the biggest shows of dissent against the country's leadership in years