Staff File Photo by Brett Clark The Walnut Street Bridge as shown from Coolidge Park at night with a long exposure.

Two teens who told Chattanooga police they witnessed gunfire on the Walnut Street Bridge Saturday could help investigators determine whether violence actually erupted among a crowd of youths that night.

But there is still no evidence that any shots were actually fired, said police spokeswoman Sgt. Jerri Weary.

Bystanders around Coolidge Park Saturday night called police to report the sound of gunshots coming from the bridge, but responding officers said they found no evidence of a shooting that night.

On Monday, police reported that they believed the sound could have been fireworks.

Weary said police are still investigating the incident, but at this point there's not enough evidence to press any charges.

Around 9:30 p.m. Monday night, officers were called to the downtown Marriott hotel after a 15-year-old boy ran in, telling hotel staff he was being chased by a rival group, Weary said.

The teen told police he was walking near College Hill Courts when a group began chasing him. The teen said he recognized one of the male assailants as the person he believed shot at him on the Walnut Street Bridge Saturday night, said Weary.

He said the suspect was armed with a black revolver.

Police also talked to a 14-year-old boy Monday night who said that he was on Walnut Street Bridge Saturday night when he and his friends were confronted and followed by a group of boys.

He said he saw a black male in a purple shirt armed with a black gun that had an extended magazine, Weary said. He also told police that the shooter was with the 15-year-old they questioned earlier and several other boys when the shots were fired.

Neither of the juveniles reported actually seeing the shooters shoot their guns.

Surveillance video recovered from the area didn't reveal evidence of a shooting.