Local sources, requesting anonymity, said security forces stormed into al-Anoud neighborhood of the provincial capital of Dammam, located about 400 kilometers (250 miles) east of the capital Riyadh, on Wednesday afternoon, triggering an exchange of gunfire with local residents.
The sources added that two opposition figures were fatally shot in the process.
On December 2, Saudi Arabia's Specialized Criminal Court sentenced five anti-regime dissidents from Eastern Province to death.
The London-based and Arabic-language Nabaa television news network, citing social media activists, reported at the time that the Riyadh-based tribunal passed the verdicts against Mahmoud Issa al-Qallaf, a resident of Ash Shweikah neighborhood in Qatif region, and four others from the town of al-Awamiyah, who were identified as Mohammed Ali al-Aqili, Ahmed Mohammed Abu Abdullah and his brother Amir, and Musa Jaafar al-Samkhan.
On September 12, the rights group Prisoners of Conscience, which is an independent non-governmental organization advocating human rights in Saudi Arabia, announced in a post on its official Twitter page that the Specialized Criminal Court had sentenced Shia cleric and human rights activist Sheikh Mohammed al-Habib to 12 years in prison and imposed a travel ban on him.