Iran has sentenced another man to death in connection with the protests triggered by the death in custody of Mahsa Amini, the judiciary said Tuesday.

The Islamic republic has been gripped by civil unrest since the September 16 death of 22-year-old Amini following her arrest for allegedly violating Iran's strict dress code.

Javad Rouhi was sentenced to death on charges of "corruption on Earth", the judiciary's Mizan Online news website reported.

The sentence, which can still be appealed, brings to 18 the total number of people the judiciary have announced have been condemned to death in connection with the protests.

Rouhi was found guilty of "leading a group of rioters", "inciting people to create insecurity", as well as of "apostasy by desecration of the Koran by burning it", Mizan Online reported.

He was also found guilty of "setting fire to and destroying property in a way that causes severe disruption to the country's public order and security", it added.

Iranian authorities say hundreds of people, including members of the security forces, have been killed and thousands arrested during the protests which they mostly describe as "riots".

Tehran accuses hostile foreign countries and opposition groups of stoking the unrest.

Four executions have been carried out, and six of those sentenced to capital punishment have been granted retrials.

According to London-based rights group Amnesty International, Iran is second only to China in its use of the death penalty, with at least 314 people executed in 2021.