The pistol used to kill unarmed black teenager Trayvon Martin which was recently put up for auction has been removed. George Zimmerman, who shot and killed the 17-year-old, had planned to auction it on the website Gun Broker. The bidding was due to begin today, with the first bid starting at $5,000 Us dollars. On the auction site, Mr Zimmerman referred to the gun as an "American icon", and says it was recently returned to him by the US Department of Justice. Mr Zimmerman, a 32 year old neighbourhood watchman, was cleared over the death of the teenager in February 2012 after saying he acted in self-defence.