REVEALED: Gunman, 34, Who Murdered TWELVE And Injured 15 In Washington Navy Yard Rampage Was Decorated Petty Officer Who Left Military In 2011 After Previous Gun Charge -- Daily Mail
* Aaron Alexis, 34, named as the heavily armed gunman who opened fire at the Washington Naval Yards in Washington D.C. - killing 12 people and injuring up to 15 more
* He is reported to have used an AR-15 assault rifle during his rampage and was also armed with a shotgun and handgun
* SWAT Teams fought a heavy gun battle with him and eventually shot him dead
* Alexis served in the U.S. Navy for almost four years before he was discharged in 2011 for 'misconduct'
* It has been reported he was kicked out of the U.S. Navy because of an arrest for discharging his own gun in 2010
* Police and FBI in the capital have said that there could be one other gunman dressed in military fatigues on the loose
* Search on for man described as being five-foot-ten inches tall, African-American and brandishing a long gun
* Special ATF team that dealt with the Boston bombings in April sent to shooting site
* Two women have also reportedly lost their lives in the shooting
* All of the people wounded are in critical condition, authorities said
* President Obama vowed Monday to hold responsible those who carried out the 'cowardly' mass shooting at the Washington Navy Yard, while calling the victims 'patriots' who served their nation.
While the motive of Aaron Alexis, the heavily armed gunman who shot dead at least 12 people in cold blood this morning at the Washington Navy Yard has not been revealed, speculation is growing his dismissal from the U.S. Navy for 'misconduct' in January 2011 may have inspired him to commit a deadly revenge.
Alexis, 34, has been revealed to have a prior arrest for letting a gun off that could have harmed his neighbor while he cleaned his own weapon at home in Fort Worth, Texas, 2010.
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