SAN FRANCISCO, California (CNN) -- Police were searching San Francisco International Airport on Friday for a missing a 12-year-old girl from China.
The girl, Yukun Jia, became separated from a youth tour group that was spending Thursday in San Francisco before heading to the U.S. Space Camp in Huntsville, Alabama. The U.S. State Department and the FBI have been notified, police said.
Police say the tour group, made up of 28 young people from Beijing and their adult guides, landed at San Francisco International Airport at 2 p.m. Thursday. The group made it through customs and went to a waiting bus.
Before the girl got on the bus she asked to use the restroom. An adult tour guide told police the girl's request was refused and she was told to get on the bus.
No head count was taken before the bus departed for an hour's tour of the Stanford University campus just south of the airport. A head count was taken as the bus was departing Stanford about 4 p.m. and the girl could not be found.
She was described as wearing a white Space Camp T-shirt and white pants with a blue stripe. Authorities said she speaks very little English.
Police at the airport began searching about 5 p.m. and continue to do so.
The tour group was scheduled to head to Alabama on Friday afternoon. Police said they do not know whether the group plans to continue their trip.