Waukesha (Wis.) South High School was on lockdown Monday morning after what the Waukesha Police Department called a "critical incident."

At a 12:30 p.m. press conference, Waukesha Police Chief Russell Jack confirmed a student brought a gun to school around 10:30 a.m.

"The suspect would not remove his hands from his pocket and continued to ignore officer's commands," Jack said. "The suspect removed the handgun from his waistband and pointed it at the officers. An officer was forced to discharge his firearm striking the suspect. Officers immediately provided lifesaving medical attention."

The shooter was transported to a local hospital, and is in stable condition, according to police. No other officers or students were injured.

The police department tweeted the building was safe and secure and a suspect was in custody around 11 a.m. Police are not seeking any other suspects and are beginning an investigation.

The lockdown was lifted and students were being released just before noon, according to the police department.

Students who spoke to WPR said they thought the lockdown was a drill. When they learned it wasn't, they said they were scared.

"I was in my government class with my friend and ... we thought it was a drill at first because they usually do those like monthly," said student Monce Lopez. "Off of social media we started figuring out what was happening. And it was just so scary to find out that there was an active school shooter inside our school."

Tenth-grader Sam Guzman said he heard what he thought were shots followed by an announcement that the school was on lockdown.

"The announcer started saying it was a lockdown — a real one, so everyone got into another corner, everyone together." Sam Guzman said. "The door was locked and the lights were off."

Darin Scheel’s son is a 10th grader at Waukesha South High School. As soon as Scheel heard the news, he jumped into his car and drove straight to the school.

As of noon Monday, he hadn’t gotten many details — but he said he wasn’t surprised this happened.

"As much as it’s been happening everywhere, you can’t take a chance and say it’s not going to happen, ya know? It’s an eye-opener that it’s closer to home, but it goes on everywhere so you can’t really close your eyes and turn your head," he said.

Schools will be open as usual Tuesday, according to Waukesha police.

Wisconsin Public Radio can be heard in the Twin Ports at 91.3 FM or online at wpr.org/news.