Three shootings in four days have left six people, including four juveniles, injured as crime heats up with the outdoor temperatures.

"It's just been one of those weeks," said Sgt. Bill Phillips, head of the Chattanooga police homicide division.

A shooting early Tuesday morning near the intersection of Fourth and Cherry streets left a juvenile male with a gunshot wound to his leg and an 18-year-old girl with a graze to her shoulder.

On Thursday morning, three juveniles told police they were walking south on Fourth Avenue about 1 a.m. when a white vehicle drove toward them, said Chattanooga Police Department spokeswoman Sgt. Jerri Weary. Someone inside the vehicle began firing a gun and the juveniles were struck in the arms and legs.

On Friday morning, police responded to 1788 Ocoee St. about 3 a.m. and found Joseph Gray suffering from gunshot wounds to his chest and back, Sgt. Weary said.

Police took three people into custody in connection with Tuesday's shooting, which was thought to be gang-related, and are pursuing leads in the others, she said.

The shootings do not appear to be related, Sgt. Phillips said.

"Not that we've been able to pick out, but now it's just been one after the other," he said.

The shootings also are not thought to be connected with the Riverbend Festival or the Bessie Smith Strut, but may simply have to do with more people being outside because of summer, Sgt. Phillips said.

On Monday, police announced a roundup of nearly 50 known gang members in Chattanooga and surrounding counties who were indicted on various criminal charges. Law enforcement officials said then that they would continue their efforts to get violent criminals off the street, even after the official roundup ended.

Police continue their vigilance in searching for criminals, including those individuals who may be trying to establish themselves in the criminal community through violence, Deputy Chief Mark Rawlston said.

"There are proactive things we can do -- increased patrols, increased attention to specific areas," he said. "You can't be everywhere all the time."