Three gunmen on Monday went on the rampage in the high-security Washington Navy Yard located a short distance from the White House, killing at least thirteen persons and injuring several more in an audacious mass shooting.
Aaron Alexis, the alleged gunman who killed 12 people including an Indian American inside a heavily guarded Washington Navy Yard on Monday, had a history of mental illness, law enforcement officials have said."Initial reports indicate that this is an individual who may have had some mental health problems," US President Barack Obama said.