Syrian opposition forces may have executed as many as 30 people most of them government soldiers in rural Aleppo according to the United Nations which cited videos of the killings posted on the Internet in July UN High Commissioner for Human Rights Navi Pillay called the allegations deeply shocking and called Friday for an independent investigation into the incident which appears to have taken place in Khan alAssal in northern SyriaThere needs to be a thorough independent investigation to establish whether war crimes have been committed and those responsible for such crimes should be brought to justice Pillay said in a statement The videos posted to the Internet between July 22 and 26 show government soldiers being ordered to lie on the ground bodies being collected by doctors corpses strewn along a wall and bodies in Khan alAssal bearing gunshot wounds to the head Pillays office also has information that Syrian rebels are still holding government officers and soldiers prisoner the statement said Reminding opposition forces that all captured or wounded soldiers must be treated in accordance with international law Pillay said Opposition forces should not think they are immune from prosecution They must adhere to their responsibilities under international lawThe UN Independent International Commission of Inquiry on the Syrian Arab Republic has previously said both rebel groups and government forces and their affiliated militias are demonstrating emerging patterns of summary execution and murderNews of the killings came as the Local Coordination Committees an umbrella group for the opposition said 19 of its loyalists had been killed including two children Most of the deaths came in Damascus the LCC said In a speech to government forces Thursday  Army Foundation Day  President Bashar alAssad said he was confident the government would triumph over the opposition according to the staterun Syrian Arab News AgencyHad we in Syria not been confident of victory we would not have been able to remain steadfast and resist the aggression for over two years the president said according to SANA The UN human rights office also said Friday that investigators have been allowed to visit rebelcontrolled Khan alAssal as part of a separate investigation into the alleged use of chemical weapons The rebels announced Friday they had written UN Secretary General Ban Kimoon requesting an investigation and demanding that any individuals found to be involved in the deployment of chemical weapons in Syria be held accountable for these crimesAccording to the United Nations more than 100000 people have been killed since fighting began Almost 2 million have fled the country and 4 million more have been internally displaced CNNs Eliott C McLaughlin contributed to this report 