BAGHDAD, IRAQ (CNN) -- Authorities in northern Iraq arrested four people in connection with the so-called "honor killing" last month of a Kurdish teen -- a startling, morbid pummeling caught on a mobile phone video camera and broadcast around the world.Two of the four arrested are members of the victim's family, police in Nineveh province said Thursday. Four others, including a cousin thought to have instigated the killing, are being sought.The case portrays the tragedy and brutality of "honor killings" in the Muslim world. Honor killings take place when family members kill relatives, almost always female, because their alleged actions shame a family.Dozens of honor killings are reported in Iraq every year. The practice has been condemned around the world by governments and human rights groups. A yearly vigil protesting honor killings is held in London, England.In this case, Dua Khalil, a 17-year-old Kurdish girl whose religion is Yazidi, was dragged into a crowd with police looking on and kicked, beaten and stoned to death last month. (Watch the attack, and what authorities are doing about it )link belowAuthorities believe she was killed for being seen with a Sunni Muslim man. The Yazidis, who observe an ancient Middle Eastern religion, look down on mixing with people of another faith.The killing is said to have spurred the killings of about two dozen Yazidi men by Sunni Muslims in the Mosul area two weeks later.The violence ratcheted up tensions between Yazids and Muslims in Bashiqa, the victim's hometown, a largely Yazidi city in Nineveh province.Provincial officials don't think much could have been done to stop the killing, but at least three officers are being investigated and could be fired. Also, the top police official in Bashiqa is being replaced. ......video linkhttp://edition.cnn.com/2007/WORLD/meast/05...q.honorkilling/