President Barack Obama is set to meet on Friday with the families of the victims of the San Bernardino mass shooting.
Obama is adding the stop in Southern California to a previously scheduled trip to Hawaii for Christmas vacation.
Fourteen people were killed and 21 others were injured at a workplace holiday party in San Bernardino by a gun-wielding husband-and-wife team. Federal authorities say the couple had become self-radicalized years before the Dec. 2 attack.
The California shootings came soon after attacks in Paris that killed 130 people on Nov. 13. The Islamic State group claimed responsibility for the Paris attacks.
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Both incidents have heightened public fears of additional attacks on U.S. soil.