President Barack Obama, U.S. Sen. John Cornyn and Texas Gov. Rick Perry are to speak at a memorial to victims killed in a Central Texas fertilizer plant blast.
Fourteen firefighters and other first-responders died as a fire at the West Fertilizer plant erupted in an explosion that shattered the small town of West last week. Hundreds others were injured.
The service is scheduled for Thursday at Baylor University's Ferrell Center in Waco.
Obama has ordered that the U.S. flag at federal buildings and military facilities in Texas be flown at half-staff Thursday in memory of the victims. He had already planned to be in the state for Thursday's dedication of former President George W. Bush's presidential library at Southern Methodist University.