Official: Arab League monitors made 'mistakes' NEW: Group issues report about regime prisons Thousands of people have died in Syria More than 550 detainees are being released by Syria The Arab League wants help from the U.N. (CNN) -- Arab League monitors made "mistakes" during their fact-finding mission in Syria, Qatar's foreign minister said on Thursday. Sheikh Hamad bin Jassim al-Thani told reporters that the league is seeking technical assistance from the United Nations for its mission, lambasted by many critics for failing to halt violence He didn't elaborate on the errors, but he stressed that the mission was of an "observatory nature, not to intervene in stopping the violence." Members of the Syrian National Council opposition movement met with Arab League officials in Cairo on Thursday to discuss the mission. "We requested more monitors and better logistical and general support to the mission," council member Walid Buni told CNN. We also highlighted some of their mistakes and requested the league be more precise in their statements. Buni cited an example of what he said was a mistake. He said Nabil el-Araby, the Arab League secretary-general, announced the release of nearly 3,500 detainees, but noted that the information came from the Syrian government and hadn't been verified. "I think these mistakes are due to the limited experience some of the monitors have in dealing with such a regime," Buni said. Syrian state TV announced the release on Thursday of 552 detainees "whose hands were not stained with the blood of fellow Syrians." The government has announced the release of other detainees during the observer mission. Between 5,000 and more than 6,000 deaths have occurred over the last 10 months during the government crackdown against protesters, according to various counts. President Bashar Al-Assad's government says it is putting down armed terrorists and blames the bloodshed on them. On Wednesday, the death toll across Syria was 26 -- 19 in Homs, four in the Damascus suburbs, two in Daraa and one in Hama -- according to the Syrian Revolution Coordinators Union, an Egypt-based opposition group. The al-Assad government agreed to a peace initiative with the Arab League that calls for security forces to withdraw from cities, release detainees and end violence. That mission began late last month. Since the conflict began, reports on brutality in Syria have been issued by political activists and human rights watchdogs. The political activist group Avaaz issued a report on Thursday detailing "atrocities"in Syria's detention facilities. Bashar al-Assad's security forces are detaining and in most cases torturing Syrian citizens opposed to the regime in overcrowded prisons, jails and illegal detention centers across the country. Avaaz has compiled the locations of these dungeons -- which even include schools -- and the names of regime loyalists running the facilities and the torturers-in-chief setting detention policy at the highest levels," the group said. The group called on the Arab League monitors to visit what Stephanie Brancaforte, an Avaaz campaign director, called "torture chambers." The group said 69,000 people have been detained over a-nine month period and more than 6,800 people have died, including more than 600 by "torture." "Of the 69,000 detained since March, over 37,000 people remain in detention and some 32,000 people have been released, many of them bearing scars from torture and violence," Avaaz said. The group said it confirms deaths or arrests with "three independent sources, including a family member of the deceased and in the case of a death, the imam who performed the funeral procession." CNN cannot independently confirm events inside Syria because the government restricts the activity of international journalists. CNN's Mohamed Fadel Fahmy and Schams Elwazer contributed to this report