Following the shooting, a fight at a hospital triggered a lockdown.

MAPLEWOOD, Minn. — Three people are hospitalized and a 23-year-old man is in custody following a shooting in Maplewood Wednesday afternoon.

Public Safety Director, Scott Nadeau says at least one of those victims is in critical condition.

Neighbor Karla Sand was on her way to a rally for gun control when she encountered the gun violence next door, on the 400 block of S. McKnight Rd.

"It's right here at home. It's right here," she said. "We have to be careful, how we treat people, how we make them live. How we're not able to give them decent living arrangements. It's sad."

Maplewood Police say the three victims were a 21-year-old man from St. Paul, a 12-year-old boy from Maplewood, and a 15-year-old boy whose city of residence isn't known. Two people were initially detained by officers in the wake of the shooting, including a 23-year-old Maplewood man who was arrested for first degree assault. That man remains in custody.

Nadeau said he's not aware of a motive for the crime, but says it is still very early in the investigation.

Following the shooting, the victims were taken to Regions Hospital in St. Paul, where a fight broke out between family members who wanted to see one of the victims, and hospital staff. The chaos led to a nearly 16 minute lockdown of the hospital, according to Regions Hospital.

"People were screaming, trying to get into the emergency room. People were crying," explained Geri House, who was on the second floor of the hospital during the lockdown. "It was getting very chaotic."

House says it was scary, especially in light of the recent spate of mass shootings around the country.

The lockdown ended at around 7:30 p.m. on Wednesday.