FOG BLOG U.S. BREAKING NEWS LOG: DAYS AFTER MASS SHOOTING IN UVALDE TX, NOW SHOOTINGS IN CHATANOOGA

6 people shot in downtown Chattanooga, Tennessee, on Saturday night Six people were shot, and two of them suffered life-threatening injuries, following an altercation between two groups of people in downtown Chattanooga, Tennessee, on Saturday night, police said.

Patrolling officers heard gunshots around 11 p.m. in the Cherry Street area and arrived at a scene of "multiple parties exchanging gunfire and numerous people fleeing the area," said police.

"Two individuals from one group started firing upon the other group," Chattanooga Police Chief Celeste Murphy said in a news conference Sunday. "They believe that there wasn't one intended target -- at least in that other group -- and all of the other victims that were shot were unintended."

Investigators believe the shooting was not gang-related, Murphy said.

Multiple gunshot victims were taken to a hospital for treatment, said police Sgt. Jeremy Eames. Four are expected to survive while two have life-threatening injuries, he said. Most of those shot were teenagers or in their early 20s, he added.

"We had large groups of juveniles walking around the downtown area this date and we believe it's from within that group that the shooting took place," he said. One person detained in connection to the incident has since been ruled out as a suspect and no one is in custody as of Sunday afternoon, police said at the news conference.

Chattanooga Mayor Tim Kelly, who was at the news conference, said he was "experiencing a wide range of emotions" following the shooting. "I'm heartbroken for the families and victims whose lives were upended last night by gunfire," he said.

The mayor also asked that parents be responsible for knowing where their firearms are and store them properly out of their children's reach.

"If you know your kid has access to a firearm, you must intervene before someone, perhaps even your own child, ends up dead," he said.

Kelly said he was joining other mayors from across the United States calling on the Senate to pass reforms to gun safety laws.

Murphy said investigators are reviewing all videos related to the incident.

There have been 221 mass shootings so far this year, according to the Gun Violence Archive. A mass shooting is defined as an incident with at least four people shot, excluding the shooter. The shooting also comes days after an 18-year-old used a legally purchased AR-15-style rifle to kill 19 children and two teachers at an elementary school in Uvalde, Texas, again raising questions about whether such weapons should be legally available.