Authorities prepare for protests that could turn into demonstrations against government . Students Day - anniversary of 1953 killing of three students by Iran 's security forces . In central Tehran , plumes of smoke rose from a large garbage bin that had been set on fire , witnesses told CNN . Day is also a ` ` symbol of Iran 's struggle against tyranny , '' says ILNA news agency .
Authorities prepare for protests that could turn into demonstrations against government . Students Day - anniversary of 1953 killing of three students by Iran 's security forces . Day is also a ` ` symbol of Iran 's struggle against tyranny , '' says ILNA news agency .