Police identified the gunman as a former military contractor, Aaron Alexis of Fort Worth, Texas. They say it's not clear how he get access to the U.S. navy yard without proper identification and what his motive was. ____________________警方确认了枪手的身份是前军事承包商,来自沃斯堡市的亚伦.亚丽克西斯.他们表示,现在还不清楚他是如何在没有身份证明的情况下进入到美国海军工厂,他的作案动机也还不明确.____________________
