The Fourth of July is a busy weekend, with thousands of people expected to attend fireworks displays in several communities.

"You want to live a normal life," Phillips said as she stood outside a grocery store. "But you just can't."

Every available police officer will work the weekend, Blanton said, acknowledging that there is "real fear in the county." He urged people to take precautions such as going out in groups and calling 911 if their cars break down and they are stuck on the side of the road.

"If someone breaks into my house, I'm armed and ready," said Mike Daniels, 53, a retired Army sergeant. "And I won't hesitate to shoot first and ask questions later."

Hazel Smith, 47, said neighbors feel vulnerable.

"If he killed once, he'll kill again," she said sitting on the front porch with her friends. "Tonight, I'm going to stay inside and pray, pray a little harder that he gets caught."

The latest shootings happened less than a half-mile from the sheriff's office, where at least 30 investigators were already working on the case. Blanton said a profiler has suggested Tyler and his daughter might have been shot to taunt investigators, but he said his only concern is solving the case.

"We had a 15-year-old girl shot; he killed an 83-year-old woman," Blanton said. "The good people of this community don't deserve that."

The sheriff reminded people they have a right to protect themselves and advised salesmen and others to avoid knocking on strangers' doors with so many on heightened alert.

"People are going to start shooting at shadows," Blanton said.