UPPER DARBY, Pa. -- A mother and her three children were arrested after stripping off and running stark naked around a Pennsylvania high school parking lot, while chanting and praying to Jesus, WTXF reported.

Fox Exclusive: Naked Protest In Front Of High School: MyFoxPHILLY.com

Sarah Butler, 44, daughters Joanne, 23, and Bessie, 22, and her 14-year-old son were taken into custody Friday afternoon after the bizarre incident unfolded in front of shocked students at Upper Darby High School, just outside Philadelphia.

The incident was sparked after Sarah Butler repeatedly tried to take another one of her sons out of the school but was refused. The boy is her biological son, but she does not have legal rights to him, sources told the TV station.

After the mother was turned away three times, the Butlers were filmed by students taking off their clothes, chanting and scuffling with security guards.

More On This... Philadelphia woman accused of illegal butt injections told to stay away from needles, glue

Upper Darby Police Department superintendent Michael Chitwood said that the family members were screaming, "Praise the Lord, Jesus Christ is good," while they ran around nude.

Cell phone videos and pictures of the incident flooded Twitter and other social-networking sites.

"We were all shocked and taking videos. We didn't know what to do, so we just kept watching," student Derek Owens said. "[The Butlers] were screaming and running around the car trying to get away, and then they [police] just forced them into a paddy wagon."

"It's pretty crazy. You don't see that every day, like, especially out the window at Upper Darby High School," fellow student Meagan Massey added.

The family faces charges of indecent exposure, criminal trespass and disorderly conduct.

The mother and one daughter were later admitted to a psychiatric hospital for assessment.

Click here for more on this story from MyFoxPhilly.