Multiple photos posted on the Irvine Police Department's Instagram and Facebook show the same man tampering with critical devices meant to prevent wildfires.
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Police say this has been happening in the open space area near Lake Forest and Bake Parkway.
"These devices are critical to keeping our community safe," said police in a statement.
It's unclear when these incidents took place, but officers are asking the public's help to identify the man. In one photo, the man is seen wearing cargo shorts and a white T-shirt. In another, he's seen riding a black bicycle.
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Anyone with information is urged to contact the Irvine Police Department.