(NBC News) -- The mass shooting at the Washington Navy Yard is reinvigorating the fight for gun reform.
On Capitol Hill Wednesday, new town families rallied for expanded background checks and marking the nine month anniversary of the Sandy Hook Elementary shooting tragedy.
The Newtown families are among the growing number of people pleading with Congress not to let another mass shooting go by without making changes to the current gun laws.
Families of gun violence victims clung to their loved ones pictures on Capitol Hill.
"They are all different colors and class, but they had the same thing in common. They were someone who did not deserve to die," said one Newtown representative.
"We need congress to extend background checks to every gun sold in America," said another gun law supporter.
Proponents of gun reform had been planning to gather this week ahead of a congressional hearing on stand your ground laws that got postponed.
They were also marking the nine month anniversary of the shooting that killed 26 women and children at Sandy Hook Elementary.
All that changed after the latest mass shooting at the Washington Navy Yard.
"How many people have to lose their lives before we realize that we have an obligation to stop this," said Senator Chris Murphy of Connecticut.
New York City Mayor Michael Bloomberg revealed a new investigation by mayors against illegal guns.
That investigation shows thousands of individuals with criminal records are trying to buy guns illegally through online sales
"In the digital age, felons and domestic abusers can do so online with little more than a phone number or email address," said Mayor Bloomberg.
The White House has also joined lawmakers calling for background checks and other gun control measures.
But any real change remains unlikely in congress as leaders in both the House and Senate say they don't have enough votes to pass a gun control bill.
-- Danielle Leigh, NBC News reports