Police say just after 12 noon, a man called several times, threatening the Sports and Medical Sciences Academy at 280 Huyshope Avenue. The man said he was in the building and threatened to harm himself and others with a gun.
This prompted the school to go into a lockdown.
Police and SWAT teams responded to the building and found nothing in the school.
On Tuesday night, investigators determined that the call originated from overseas. They think it was a swatting case, meant to trigger a large-scale police response.
The state just stiffened penalties for crimes like this but oftentimes these criminals are hard to track down and catch.
Students will be back at school on Wednesday but with additional security provided by Hartford police out of an abudance of caution.