UPDATE 5:23 p.m.
The death toll from the tour bus crash in Palm Springs, California, has risen to 13, California Highway Patrol Chief Jim Abele said in a press conference Sunday.
The bus driver was among those killed.
Thirty-one people were injured in the crash. It is still unclear what caused the wreck.
WATCH: A tour bus collided with a semi-truck killing at least 11 people.
At least 11 people have passed away after a tour bus driving through the desert hot springs near Los Angeles collided with a semi-truck earlier this morning, reports The Desert Sun.
Of the passengers on the bus, 31 were transported to hospitals with minor to severe injuries, according to authorities. The driver of the semi-truck was unhurt.
All traffic on the freeway where the crash occurred has stopped.
The tour bus belongs to a company called USA Holiday, which generally ferries people from Los Angeles to casinos in southern California.
It's unclear where exactly the bus was coming from.
The company has posted about trips it makes on its Facebook page, but no trip has been promoted on social media since mid-September.
The ministry is praying for the victims of a tour bus & big-rig crash near Palm Springs, where @ least 11 were killed & many others injured.— God's Minister (@OTWOL) October 23, 2016
Some have taken to social media to offer prayer for the departed.