"The awareness has been raised," he said. "You're not seeing as many garage doors open when you drive through a neighborhood. Everyone is locking their doors. People are very, very concerned that there is a killer or killers on the loose in Lancaster County."
He said customers are adding deadbolts to their doors and installing floodlights.
"They're not concerned about possessions," he said. "They're not saying that at all. This is a personal protection system they want. They're scared, they're paranoid, they're fearful."
Blossom Hill Mennonite Church Pastor Jane Peifer said she is counseling congregants and community members who seek her guidance to find strength and faith in numbers.
"There's really no way that we can say there's nothing to be afraid of, because there is," she said. "This is extremely frightening to have this kind of trauma that's unsolved. The police are telling you to leave the lights on and lock the doors. It's foolish to say there's nothing to be afraid of, but I somehow believe that God is with us through all hard times in life."
Peifer said she was in the midst of writing her sermon for Sunday's services.
"I was just reflecting on how being with each other is so encouraging and strengthening. In my experience, [being together] is the greatest comfort, and one in which I've very often experienced the presence of God."
Police have been inundated with tips to the county Crimestoppers line, but one tip in particular got the authorities' full attention last Thursday. A caller dialed into the tip line and provided some information that "investigators felt might be valuable," Rudzinski told ABC News, declining to elaborate.
"But in this particular case, the [caller] gave some quick information and then hung up before we could ask questions or assign them a number that would enable them to collect a reward later should their information help lead to an arrest.
"We have literally no way of identifying this person, so we can't even go public and say, 'No. 5, please call us.'"
Rudzinski said police need the public's help on this case.
"We continue to look for information on the family members, any background information, anything of importance about this family, or about the homicides, we are very interested in hearing," he said. "We are still trying to work up a victimology on each of these victims -- their backgrounds, their interests. Anybody who has any information that they think might be helpful should get in contact with us."
Rudzinski urged anyone with any information to contact Manheim Township police at (717) 569-6401. He said the phones are staffed around the clock.
Since the murders, Lancaster's Crimestoppers program posted a $1,000 reward but on Thursday, Manheim Township commissioners approved creating an account for soliciting donations to a rewards fund. Rudzinski said that the contributions to the rewards fund should be sent to Manheim Township, Attention: Finance Director, 1840 Municipal Drive, Lancaster, Pa. 17601.
Additional reporting by Laura E. Davis.