The California Highway Patrol said it is investigating the organizers of an underground rave set up over the weekend under a freeway bridge in Palm City. Early Sunday morning, CHP officers cleared out hundreds of teenagers and young adults from beneath the I-5 bridge near Main Street. The illegal party started Saturday night. The CHP said officers responded after a parent tracked his daughter to the location with an iPhone app. “We received a call from a concerned father that his daughter was in an area stationary for about 20 minutes,” said Jake Sanchez, a public information officer with CHP. MORE: https://www.cbs8.com/article/news/local/chp-seizes-equipment-from-underground-rave/509-a29e77f9-4a07-4a5b-8eac-e88c30789601