Clashes broke out between hundreds of protesters and police forces west of the Bahraini capital Manama on Saturday following the funeral procession of a teenage protester, dpa reported.
Thousands took part in the Saturday funeral procession in the 16-year-old boy's hometown Sitra, despite a police lock-down of the area to prevent mourners from reaching the funeral.
Shortly after the funeral, police forces fired tear-gas and stormed the area to prevent the protesters from reaching the main-road.
Activists said the boy, Ali al-Badah, was hit by a police car during a protest in the suburb of Juffair, in eastern Manama.
Authorities said the driver lost control after hitting a patch of oil on the narrow street, and that the case has been handed to the Public Prosecutor office to investigate.
Protesters alleged the police car intentionally attempted to run them over.
The leading Shiite opposition grouping Al-Wefaq, described the incident as reflection of the dangerous tactic used by security forces to drive their cars at high-speed when dealing with protesters with disregard for safety and lives.
The liberal opposition group Waad condemned the incident and called for a halt of the killings and the group punishment of citizens.
Protests demanding political reform and greater freedoms in Sunni-ruled, Shiite-majority Bahrain, began on February 14. Government forces carried out a crackdown against the demonstrations, killing at least 40 people.
An independent commission set up by King Hamad bin Isa al-Khalifa to investigate the events of the pro-reform protests and consequences is expected to present its findings by Wednesday.