Clash between rival gangs also results in 18 injuries.
The president hosted a summit for the Gulf Cooperation Council in hopes of bridging divide over Iran.
Train was traveling at twice the speed limit, experts say.
Overturning a 2013 ruling, the judges did not, however, halt the program but urged Congress to take action.
Nevada green-lights the testing of Daimler's autonomous trucks in ordinary traffic.U.S.,autonomous vehicles,Daimler,driverless cars,Michael Lerner
Says militant group responsible for systematic human rights abuses.
Group's decision to honor the French satirical weekly drew heavy criticism.
Believed to be first time Islamic State claimed to carry out operation in U.S.
Talks are crucial next step in their historic detente.
Passenger train jumped tracks in Philadelphia, causing chaotic scene.
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