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A Facebook post claiming a student had threatened to "shoot up" Andrews High School led to a police investigation Friday.

Officers with the Georgetown County Sheriff's Office were at Andrews High after being notified about the post by school officials. The school was deemed safe and operated as normal.

Also on Friday, The Georgetown Police Department investigated a claim that a gun or knife had been brought to Georgetown High, but police determined there was "no credible threat."

The events came two days after a mass shooting at a south Florida high school left 17 people dead, reviving a national discussion about school safety and gun control. In the days after the shooting, reports of copyat threats caused alarm at schools across the country. In Horry County, reports said a 14-year-old student was charged with disturbing schools in connection to a threat made on social media against Socastee High School.

The Facebook post relating to Andrews High said a boy at the school was threatening to "shoot the school up then blow it up." The post went online at 5:18 p.m. Thursday and by Friday morning had been shared 240 times. It said the boy sits in class everyday watching videos of how to make bombs and that "teachers ignore it."

"He hasn't been expelled yet..they just put him in counseling & said he has 'mental issues,'" the post said.

In comments on the post, people said they planned to contact law enforcement and school officials. One commenter said, "My children will not return to school until this is handled."

In a statement, the Georgetown County School District said that officials immediately contacted law enforcement after learning about the post.