Vice President Joe Biden will attend a memorial in Arizona on Tuesday for the 19 firefighters killed in a raging wildfire, the White House confirms.

Biden will travel to the Prescott area to attend a service honoring the members of the elite Granite Mountain Hotshot crew who were killed Sunday while battling the Yarnell fire.

Their deaths marked the worst wildfire tragedy since 1933 and the deadliest day for U.S. firefighters since the events of 9/11.

It has been speculated that President Obama might attend the memorial. While the White House has yet to release the president's schedule for next week, it's rare that both the president and vice president would attend this kind of event.