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“Nobody trusts anybody anymore,” he said.

The only real clue police have revealed in Jessica’s disappearance is the discovery over the weekend of a backpack and water bottle that she had with her when she disappeared. Police won’t discuss what was found in the bag or test results on it.

The items were found in the town of Superior, some six miles from Jessica’s home.

Additional police were sent to Jessica’s school, said Lynn Setzer, spokeswoman for Jeffco Public Schools. The district has its own security officers at other middle schools and high schools.

Steve Saunders, a spokesman for nearby Adams County schools, said the district is trying to strike a balance between reassuring students and their parents that they are safe, while encouraging them to be vigilant.

Saunders said the district has security officers at all middle schools and high schools, but not elementary schools. He said the district will seek more help if authorities believe it is warranted.