American authorities say a 14-year-old girl in Canada has been charged with threatening a high school in New Hampshire.

Police in Hanover, N.H., say they learned about an Instagram post early Tuesday morning that threatened Hanover High School and mentioned a shooting.

They say the threat was traced to a home in Canada but won't say where.

Investigators say Canadian officers executed a search warrant and seized electronic devices.

The girl was arrested but police offered no further details.

The threat came a day after provincial police announced charges against five tweens and teens with threatening schools in Ontario in the weeks since the massacre at a Florida high school last month.

Sgt. Peter Leon of the Ontario Provincial Police said those accused also used Instagram.

Experts have said online threats tend to spike after high-profile school shootings. Aimee Morrison, a professor of digital media at the University of Waterloo said Tuesday that some teens make threats on social media in an attempt to gain notoriety and garner a larger following.