At least six people were stabbed in an attack at a Pennsylvania high school on Wednesday morning, according to local media reports.
The stabbings occurred at Franklin Regional High School in Murrysville, about 20 miles east of Pittsburgh, Pittsburgh's WTAE and other local news channels reported, citing the emergency management office in Westmoreland County.
The school district posted an emergency message on its website on Wednesday.
"A critical incident has occurred at the high school," the message said. "All elementary schools are canceled, the middle school and high school students are secure."
Further information was not immediately available.