Chicago: Four people were wounded and a suspected gunman dead after a shooting at Mercy Hospital on Monday afternoon, local time, said reports. One of the wounded was reportedly a police officer. He and two of the other injured persons are in critical condition, authorities said. Also Read - US Registers Highest Spike in a Day as 865 Die of COVID-19 Within 24 Hours

It was not immediately clear whether the shooter took his own life or was killed by police. Christine Calace, a police department spokeswoman, told media shots were fired inside and outside the hospital building. Also Read - US Stocks End Lower Amid Fast Spread of Coronavirus

A witness claimed that the attacker was shooting at random.  The shooting apparently began as the suspect was walking with a woman near a parking lot. He shot the woman in the chest, then entered the hospital while continuing to fire indiscriminately. Also Read - US Will Not Pay for Harry, Meghan Markle's Security: Trump

A police officer gave chase and the bystanders heard him fire another half a dozen shots. “We heard more gunshots and arguing,” a staff said. “We stayed barricaded for about 30 minutes until the police (arrived) and we ran out a back (exit).”

There were news media reports of a large police presence in the area and mass evacuations at the hospital.

Mercy Hospital and Medical Center is a 292-bed hospital. Monday’s incident comes a few weeks after gunfire shook the nation with two bloody rampages, one at a bar in Thousand Oaks, California, and another at a synagogue in Pittsburgh.