Police say Aaron Alexis entered the Navy Yard with a 12-gauge shotgun.
In the aftermath of the Navy Yard shootings, D.C. Mayor Vincent Gray says Virginia's gun laws have made the District less safe.
Just days before the alleged gunman Aaron Alexis shot and killed 12 people, law enforcement officials say he purchased a shotgun at a gun store in Virginia, passing all of the state and federal background checks.
Now two days after the mass shootings, Mayor Gray is calling on Congress to pass sensible gun control legislation at the federal level, and further calling out Virginia specifically for its relatively lax gun laws.
"This shotgun was bought in Lorton, Va. We can have whatever gun control laws in the District of Columbia, but we are completely vulnerable to surrounding jurisdictions whose laws may be more lax than ours," Gray says.
Meanwhile, Gray announced a new fund to help the victims' family members and those injured in the attack.
Its called the "Navy Yard Relief Fund" and 100 percent of the contributions will go to the families.