al-Assad to step down. We call on the -LRB- al-Assad -RRB- regime to immediately cease all violence against the Syrian people and release all political prisoners. We again call on -LRB- al-Assad -RRB- to step aside and allow the Syrian people to embark upon the democratic transformation they demand, she said the in the statement. A video posted on YouTube purportedly showing the funeral of Mattar in Darya showed people marching in the street and chanting: We will sacrifice our lives and our blood for you, Ghiyath and Freedom, freedom, we are the youths of freedom. Mattar's colleague said that Syrian security forces fired on mourners, and that one man was shot and later died. CNN can not independently verify the authenticity of the video, the claims or the death toll because the government has repeatedly denied requests for journalists to report inside Syria. CNN's Salma Abdelaziz, Maxim Tkachenko, Mohammed Jamjoom and Yousuf Basil contributed to this report.