Tucson Mayor Jonathan Rothschild rang a bell at the downtown fire station 19 times Tuesday morning to note the moment two years ago when Jared Lee Loughner opened fire.
Rothschild rang the bell one time for each of the six people killed and 13 wounded in the attack at a meet-your-congresswoman event being held by former Rep. Gabrielle Giffords.
Giffords was critically wounded in the attack and she resigned from Congress last year.
Tuesday, Giffords and her husband launched a political action committee aimed at curbing gun violence. They say their initiative will help raise money to support gun control efforts.
Also today, two politicians at the opposite ends of the gun debate held competing weapons-buy-back events outside a police station in Tucson. A city councilman asked people to turn in their guns for a $50 gift certificate from Safeway. That's the grocery store chain that owned the market that was the scene of the shooting.
In response, a Republican state senator who is a gun-rights advocate positioned himself outside the same police station and offered cash for guns. Several people waved signs and held up money to approaching drivers to announce that they were willing to buy their guns.
Video: FOX 10's Steve Krafft reports.
This is a developing story. Stay with FOX 10 News for updates.
The Associated Press contributed to this story.