A shooting was reported Wednesday at the Annunciation Catholic School in Minneapolis, according to the state's governor, Tim Walz.

Walz wrote on X that "I’ve been briefed on a shooting at Annunciation Catholic School" and "I’m praying for our kids and teachers whose first week of school was marred by this horrific act of violence." 

Minneapolis Mayor Jacob Frey said, "I'm monitoring reports of horrific violence in South Minneapolis. 

"I'm in touch with Chief O'Hara and our emergency response team has been activated. We will share more information as soon as we can. Please give our officers the space they need to respond to the situation," he added. 

ATF agents "are responding to reports of an active shooter situation at Annunciation Church in Minneapolis," the agency’s St. Paul Office said. 

This is a developing story. Please check back for updates.