WASHINGTON - About 20 students were injured Wednesday morning after a stabbing spree inside a high school in the US State of Pennsylvanian at the start of the school day.

The suspect was taken into custody shortly after the incident and nine of the injured have been taken to hospital, the US Cable News Network (CNN) reported.

The Franklin Regional High School was on lockdown, and students were being kept there for safety, the CNN said.

No fatalities were reported so far.