Christopher Marks' Family Told They May Be Able to Search Later

St. Louis County Police Chief Tim Fitch gathered the family and friends of into a huddle near the scene of the incident Tuesday morning and told them it is time to be prepared for all options.

He reassured family members that the professionals conducting the search and rescue efforts would go by a "check-check-check" system, all over again today.

Missing Christopher Marks was last seen swinging from a tire above the Meramec River by a family member with him Sunday night at the Pacific Palisades Conservation Area near the -Pacific borderline, confirmed St. Louis County Police Chief Tim Fitch at the incident scene Tuesday at approximately 8:10 a.m.

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Fitch reminded Marks' family members that temperatures today are expected to reach 100 degrees. He told them police feared that volunteers also may get lost in the process of searching such rigorous terrain. "We don't want someone else to get lost, and no one should be out here at dark," he said.

Update at 9:44 a.m.:  About 100 officer units are expected to return to the scene of the incident today. More K-9 units steadily are pouring in. The Salvation Army mobile van just arrived, presumably to help with water and assistance to the search crews.