The demonstrators gathered at Imam Hussein Mosque in the eastern town of Awamiyah in the Qatif region following Friday prayers and demanded the immediate release of several Shiite activists who are on death row, including Ali Mohammed Baqir al-Nimr, the nephew of prominent Shiite cleric Ayatollah Nimr Baqir al-Nimr, who was 17 when he was arrested in 2012.

“They gathered to demand their freedom,” an unnamed resident was quoted by AFP as saying.

Ali Mohammad was arrested during an anti-government protest in Qatif and was later convicted of criminal activities and handed down a death penalty by Saudi Arabia’s Specialized Criminal Court in May 2015.

His uncle, Ayatollah Nimr, was also arrested in the Qatif in July 2012, and has been charged with undermining the kingdom’s security, making anti-government speeches, and defending political prisoners. Nimr has denied the accusations, Press TV reported.

On October 25, the Saudi Supreme Court and an appellate court approved the execution of Ayatollah Nimr and authorized the Saudi Interior Ministry to carry out the sentence. The warrant still needs to be approved by the Saudi king.

The UK-based rights group Amnesty International has called Nimr’s trial “deeply flawed” and the death sentence “appalling,” saying the verdict has to be quashed. The United Nations Secretary General Ban Ki-Moon has also called on Riyadh to halt Nimr’s execution.