The FBI and local law enforcement said bomb threats across the country have tied up government resources even when they turn out to be hoaxes.

Last March, police in Coralville, Iowa, investigated a bomb threat targeting a junior high school. Authorities brought in specially trained dogs to sniff for explosives and started looking into why someone might try to target the community’s teachers and students.

Law enforcement quickly determined that the threat was a hoax. Detective Hanna Dvorak from the Coralville Police Department arrived at a theory.

“It appears this all stems from a post made earlier this week by Chaya Raichik and her ‘Libs of TikTok’ account,” Dvorak wrote in a report to her superiors.

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Coralville was not alone. Officers and government officials in four other jurisdictions — Burbank, California; Minnetonka, Minnesota; Oklahoma City; and Tualatin, Oregon — told NBC News they believe Raichik sparked threats in their localities with her posts on social media that digitally heckle people such as drag performers, LGBTQ teachers and doctors who treat transgender patients. The name “Libs of TikTok” is a reference to the people Raichik mocks on social media — “Libs” being short for “liberal.”

While the direct inspirations for the threats are not known, the timing suggests that Libs of TikTok posts have been used to pick targets.

NBC News identified 33 instances, starting in November 2020, when people or institutions singled out by Libs of TikTok later reported bomb threats or other violent intimidation. The threats, which on average came several days after tweets from Libs of TikTok, targeted schools, libraries, hospitals, small businesses and elected officials in 16 states, Washington, D.C., and the Canadian province of Ontario. Twenty-one of the 33 threats were bomb threats, which most commonly targeted schools and were made via email.