Thousands of runners hit the streets of New York City for the Tunnel to Towers run on Sunday.
The annual 5k retraces the steps of fallen firefighter Stephen Siller, who on 9/11 ran from Brooklyn, through the Battery Tunnel to the World Trade Center.
The race honors the 343 FDNY heroes, along with law enforcement members and others killed on September 11th.
This year the organizers also honored some U.S. service members. The money raised helps first responders and wounded veterans.