Hmong International Academy was briefly locked down Monday as Minneapolis police officers searched the pre-kindergarten- 8th grade school for signs of a gunman in what turned out to be a prank.

The school was reopened after police and SWAT officers swept the building at 1501 N. 30th Av. and didn't find a gunman. Police later determined that a group of students prank-called 911 to report that there was a "person inside the school with a gun," said police spokeswoman Sgt. Catherine Michal.

"It was determined that it is a prank and the juveniles [involved] have been identified," Michal said. It wasn't immediately clear whether criminal charges will be pursued.