CHARLOTTE, N.C. -- Investigators say they have identified the person who sent threatening social media messages targeting Providence High School.
They're also investigating whether it is the same person who threatened Ardrey Kell High School.
For now, officials haven't released the person's name, but charges could be forthcoming.
CMS says it is not one of their students.
The concern at Providence High School started with a post on the anonymous social media app YikYak.
Someone said "Come Monday, you'll pay for all the pain you've caused me for years."
"When I first heard it I thought it was some sort of prank. Some senior wanting school to be over with, but he was very persistent and I wasn't sure about it," said student David Mnatsakanyan.
Mnatsakanyan still came to school and noticed all the extra police.
"I feel very safe with them around."
But, he says some classes were nearly empty.
A sign other students and their parents wanted were taking no chances.
"You just really can't trust anyone now. You can't trust the websites, you're just not sure who might have a gun in their book bag," he said.
Students say their bags weren't checked.
The district tried making the school day operate as normal as possible.
"We are taking these messages very seriously and have taken additional precautions to ensure that school runs safely and smoothly," Ardrey Kell High School Principal David Switzer said in a recorded message to parents.
That school also received a threat, but it's not clear if it was made through YikYak, or by the same person.
"We will have after school activities as normal with increased police presence. In addition, we are taking other precautions for safety, but because the safety plan is a confidential plan (for the safety of our students and staff), those measures will not be shared with the general public," Switzer said.
Some students took to YikYak in response, saying they can't believe someone caused all this trouble.