Police tape is seen at Rosa Parks Plaza near the shooting scene in Dallas, Texas, July 8, 2016. Reuters

The Federal Bureau of Investigations and Warm Springs Police Department were searching for an 11-year-old girl who went missing and could possibly be endangered. Law enforcement officers have been asking for the public’s help to locate Kaitlyn Stofiel since late Friday afternoon, according to a press release from the FBI.

Authorities said they believe Stofiel is with her custodial father, Thomas Clarence Stofiel, 44, who is known to possess several of weapons. It was reported that he has survival skills and may be distraught, police said.

"There's some concern that he may have been upset about something that happened, and so we are concerned and just want to make sure Kaitlyn is safe," FBI Portland Division spokeswoman Beth Anne Steele told local TV station KTVZ.

Kaitlyn Stofiel, 11, who was reportedly being home-schooled, is believed to be with her father Thomas Clarence Stofiel. He has survival skills and may be distraught. FBI

Stofiel's pickup truck was found parked on the Warm Springs Reservation in late February. It remains unclear whether Stofiel or his daughter, who weren’t seen in at least a week, have any connection to the reservation. Police are still investigating.

“Officers and agents simply want to locate Kaitlyn to ensure that she is safe,” the FBI wrote on its website.

The father and daughter were most recently living in Portland, and Kaitlyn Stofiel was reportedly home-schooled.

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Authorities believe Kaitlyn Stofiel is with her custodial father, Thomas Clarence Stofiel, 44. His truck was found on the Warm Springs Reservation. FBI

Police were urging the public to call 911 if they spotted the father or daughter. They were also told not to approach them.

Here's what else you should know:

Age: 44
Race: White
Height: 5'05"
Weight: 125 pounds
Hair: Brown
Eyes: Green

Age: 9
Race: White
Height: Unknown (tall and thin)
Hair: Long, dark hair
Eyes: Blue

Anyone with information on the whereabouts of the Stofiels were asked to call the FBI in Portland at 503-224-4181. Nearly 800,000 children disappear every year in the U.S., according to the National Center for Missing and Exploited Children.