DPA/Kassel, GermanyMore than 3,000 people joined hands in the German city of Kassel yesterday, forming a human chain in a peaceful protest against serial killings of immigrants by a neo-Nazi gang.One end of the chain formed outside an Internet cafe where a Turkish man, Halit Yozgat, was shot at point-blank range in 2006, one of nine immigrants killed over a seven-year period.The crimes went unsolved until the gang of three was uncovered last month.The other end of the chain reached the Kassel town hall, where the father of the dead man was invited to speak to the crowd.Organisers from the city council and the minority affairs board said 5,000 people attended, but police put the number at 3,500.Police are still investigating the crimes claimed by the so-called National Socialist Underground.Two of the gang died November 4 in an apparent suicide and the third member turned herself in.On Friday, Germany’s state and federal interior ministers appointed a panel of experts to seek a legal way to ban the far-right National Democratic Party (NPD), a small party that uses neo-Nazis to canvass for votes.A previous attempt to ban it was ruled invalid in 2003 by Constitutional Court judges because evidence had been obtained by paid informers. Any new attempt would require a way to be found to clear that legal obstacle.