( CNN ) -- Armed , masked men raise their weapons and shoot dead three men sitting on a curb in a Syrian city . The images are captured on video , purportedly showing Islamist rebels carrying out a public execution of soldiers . The incident occurred in Raqqa city , in the north . Videos produced by locals sympathetic to the Islamists have appeared on the Web , and an opposition group , the Syrian Observatory for Human Rights issued a report on the incident Tuesday . `` Rebel fighters from the Islamic State of Iraq and Bilad al-Sham ( Syria ) have summarily executed three men in the middle of a square in Raqqa city , '' the Observatory said . `` The jihadis stated that the detainees were officers from the Syrian army . '' The videos show armed masked men standing in a street , with one of them reading from a paper . A crowd of onlookers can be seen in the background . Gunmen shoot dead three men who are sitting on a curb and the militants raise their weapons in celebration . There was no immediate comment on the incident from rebel leaders and the government . This is the latest report of an atrocity in a war rife with abuse , killing and widespread population displacement . Since the unrest began in March 2011 , Syrians have described a range of human rights abuses by security forces and backers of President Bashar al-Assad 's regime . There have been claims of atrocities by rebel forces as well . The Raqqa incident comes on the heels of a horrific video showing a man said to be a Syrian rebel carving into the body of a government soldier , cutting out his heart and liver , and putting the heart in his mouth , taking a bite . Other violence persisted Wednesday . Clashes broke out between rebel fighters and regime troops at the Aleppo central prison , the Syrian Observatory for Human Rights said . The Israeli military said several Syrian rockets landed in the Mount Hermon area of the Israeli-occupied Golan Heights , on the border with Syria . At least 50 people were killed Wednesday across the country , the opposition Local Coordination Committees of Syria said . Of those , 18 were in Aleppo and four were in Raqqa . Meanwhile , the Internet is back up in Syria after being down for more than eight hours Wednesday , according to the Renesys Corp. , an Internet monitoring company . A week ago , a widespread Internet outage in Syria lasted more than 19 hours before access was restored . Diplomatic moves . On Wednesday , the U.N. General Assembly adopted a resolution calling for a political transition in Syria . The resolution , which passed by a 107-12 vote , with 59 abstentions , also condemned the government 's increased use of heavy weapons and ongoing `` widespread and systematic gross violations of human rights and fundamental freedoms , '' said a U.N. statement . It was the fifth resolution on Syria voted by the body since 2011 . `` If we are unable to do anything to stop this tragedy , then how can we sustain the moral credibility of this organization ? '' Assembly President Vuk Jeremic said before the vote , according to the statement . Meanwhile , in Sweden , U.S. Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov discussed the revival of a peace initiative based on last year 's Geneva conference . That conference , brokered by Russia and the United States , outlined how a transitional government could be formed in Syria . `` I think it 's fair to say that both of us are confident about the direction that we 're moving in and very , very hopeful that within a short period of time , the pieces will have come together fully so that the world , hopefully , will have an opportunity to be given an alternative to the violence and destruction that is taking place in Syria at this moment , '' Kerry said . Lavrov cited the Russian-American proposal to convene a conference to start implementing the Geneva communique last June . `` It 's self-explanatory , and what we need now is to mobilize support for this initiative on the basis of what was , I believe , in Geneva and what was proposed by Washington and Moscow : to mobilize support , first of all , by all the Syrian groups , the regime and all opposition groups ; and second by those outside actors who have influence on either one or the other Syrian group , '' Lavrov said . CNN 's Hamdi Alkhshali contributed to this report .
NEW : U.N. General Assembly adopts resolution on Syria , calling for transition . Comment: A video apparently shows a public execution of Syrian army officers . Israel says Syrian rockets struck in the Israeli-occupied Golan Heights , on the Syrian border .