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ST. LOUIS – St. Louis police said they’re investigating a quadruple shooting in a north city neighborhood that left two men dead. The two others are hurt.

According to a spokesperson for the St. Louis Metropolitan Police Department, the shooting happened around 9:30 p.m. in the 1400 block of Union Boulevard, located in Hamilton Heights.

St. Louis Police Chief John Hayden said two men who appeared to be in their 20s were pronounced dead at the scene.

The other two men were conscious and breathing and transported to a local hospital. One of them suffered non-life-threatening injuries. The other was in critical condition, but he was still alive as of 5:00 a.m. Tuesday.

Hayden said four people were shooting at each other from both sides of the street and that numerous shots were fired.

Hayden said people were in the area when the gunfire erupted. He is asking for any witnesses to come forward with information to the police.

Call in a tip to CrimeStoppers at 1-866-371-TIPS in order to remain anonymous.

There are no suspects yet in the investigation.

It’s the second quadruple shooting in as many days. Four people—two 18-year-old men, a 16-year-old girl, and 19-year-old Isis Mahr—were shot in the 8500 block of Church Road near McLaran Avenue just before 1:30 a.m. Sunday. Mahr was pronounced dead at the scene.