A lockdown at Winter Park High School has been lifted as of 1 p.m. Monday following a vague threat police said they believe was actually targeted to another school not in Florida, but in West Virginia.

Winter Park High School had been operating under a "modified" lockdown all morning, Orange County school officials said. During the lockdown, students were allowed to move around and change classes, but could not be unattended at any time.

Principal Tim Smith said the threat, made on social media Sunday night and reported to law enforcement, was not specific.

Winter Park police said the threat was posted on Twitter and appeared to target a school in West Virginia. A student at Musselman High School in Martinsburg, W.Va., was arrested Monday, according to the school's website.

The West Virginia student was charged with making "terrorist threats against the school principal and the students and staff," Musselman High School officials reported.

Smith notified parents of the lockdown in a phone message via the district's Connect Orange system:

Hello, this is Tim Smith, principal of Winter Park High School.

Parents: Last night a report was made to law enforcement concerning a threat to Winter Park High School. The details were not very specific and came in through social media, but we are taking extra precautions. Extra police officers are in place, and OCPS security administrators are assisting us.

Today we will be in a modified lockdown to limit extra hallway traffic and to have our classroom doors locked.

Please know that we are being extra cautious, and we have extra security in place to maintain a safe and orderly school day. Thank you.

Extra police and school security were on campus Monday, the school district said.