2013/05/06 Headlines: Syria Calls Apparent Israeli Strikes "An Act of War"; Report: U.S., Allies Discussed Syria Strikes; U.N. Investigator: Syrian Rebels Likely Using Nerve Gas; Bangladesh Toll Hits 645; Murder Probe Begins; 7 U.S. Troops Killed in Afghanistan; U.N. Seeks Nigeria Probe After 200 Killed; Obama Concludes Latin America Visit; U.S. Unemployment Rate Falls to 7.5 Percent; NRA Celebrates Defeat of Gun Control at Annual Meeting; Suicide Rate Increases for Middle-Aged Americans; U.S.