( CNN ) -- A teen and a police officer died in Bahrain clashes as protesters hit the streets Thursday on the two-year anniversary of a failed uprising in the nation , authorities said . Authorities are investigating the Thursday morning death of a 16-year-old and trying to determine how it occurred , according to a government statement . Read more : Bahrain strips Shiite activists of citizenship amid unrest . `` We encourage people to remain calm and not spread unfounded rumors until more information becomes known , '' the statement said . `` We reiterate the call ... upon parents to supervise the whereabouts of their children at all times in order to ensure their safety . We urge parents to keep their children at school and go about their daily routine . '' Al-Wefaq , Bahrain 's main Shiite opposition party , said the teen was killed when he was hit by bird pellets shot by Bahraini security forces . Police officer Mohammed Asif died late Thursday after he was hit by a `` projectile '' thrown by a group of protesters , according to Bahrain 's interior ministry . Major-General Tariq Hassan , chief of public security , said an investigation has been launched to find those responsible . Protesters demonstrated in several villages around Manama , the nation 's capital Thursday . Two years ago , on February 14 , protests began with many demanding political reforms and greater freedoms in the Sunni-ruled , Shiite majority nation . Bahraini wins human rights seat amid protests , teen 's death . The unrest was spurred by movements in Tunisia and Egypt . But demonstrations in Bahrain failed to gain the traction of other Arab Spring uprisings after a crackdown by authorities in the island state . The crackdown was backed by troops from nearby Saudi Arabia and the United Arab Emirates . In November of that year , Bahrain 's Independent Commission of Inquiry issued a report critical of authorities ' reactions to the protests . The independent commission , set up by the king , concluded that the police had used excessive force and torture in their response to the protests in Sunni-ruled , Shiite-majority country . Abuse of detainees in the crackdown included beatings with metal pipes and batons , and threats of rape and electrocution , according to Mahmoud Cherif Bassiouni , the commission chairman . The report recommended reforms to the country 's law and better training of its security forces , as well as other measures . CNN 's Saad Abedine and Mohammed Jamjoom contributed to this report .
NEW : Authorities are investigating the death and say they do not know the cause . An opposition group says Bahrain security forces killed the protesters . Thursday marked the second anniversary of major protests in Bahrain .