2012/09/17 Headlines: Chicago Mayor Threatens Lawsuit After Teachers Extend Strike; Wisconsin Judge Strikes Down Most of Anti-Union Law; NATO Bombing Kills 8 Civilians in Afghanistan; 4 U.S. Soldiers Killed in Attack by NATO Forces; U.S. Evacuates Personnel from Tunisia and Sudan as Film Unrest Spreads; Bodies of U.S. Victims Return from Libya; Netanyahu Claims Iran Approaching Nuke Advancement, 20 Years After Making Similar Claim; Occupy Wall Street Marks 1st Anniversary; Occupy Activists Stage Massive Banner Drop Across Northeast U.S.; Twitter Hands Over Account Info of Occupy Protester; Chicago Man Arrested in Informant-Enabled Plot;$