ST. LOUIS – An investigation is underway as police report an officer-involved shooting Saturday morning in south St. Louis.

Police confirmed that shots were fired in the 3800 block of Shenandoah around 9:30 a.m. on Saturday.

Officers from the St. Louis Metropolitan Police Department reports responded to a call for a subject threatening family members with a gun. Police were initially told the subject was suffering from a severe mental health crisis.

The subject reportedly made his way to the porch near officers and became extremely agitated. Investigators say he pulled out a gun and shot at an officer.

One officer returned fire and ended up shooting the subject. He was sent to a hospital with critical injuries.

No officers were injured in the shooting. Additional circumstances surrounding the shooting are not clear at this time.

This is a developing story. FOX2 news crews are headed to the location. This post will be updated with more information as it comes into the newsroom.