has people so concerned. reporter: city workers discovered it this morning, someone cut a hole in that link chain and snuck in. it was a security breech that brought investigators to the radio towers today. vandals cut a hole in this fence to get inside the perimeter. they did not make it into the building but were able to cut some exposed cables. possibly air-conditioning. i just thought that some of the smaller wires were cut but no essential city services were impacted. reporter: san francisco police and fire as well as emergency services rely on radio transmissions from twin peaks. none were interrupted. but the fbi was notified because this communication facility is so essential. police, fire, medical, public works, utilities things like that. so, exactly what wires were cut and what they went to, i don t know. reporter: and no materials such as wiring or metal are missing. police say it appears to be malicious mischief, the motive unclear. but it does illustra
twin peaks. debora villalon found out what has people so concerned. reporter: city workers discovered it this morning, someone cut a hole in that link chain and snuck in. it was a security breech that brought investigators to the radio towers today. vandals cut a hole in this fence to get inside the perimeter. they did not make it into the building but were able to cut some exposed cables. possibly air-conditioning. i just thought that some of the smaller wires were cut but no essential city services were impacted. reporter: san francisco police and fire as well as emergency services rely on radio transmissions from twin peaks. none were interrupted. but the fbi was notified because this communication facility is so essential. police, fire, medical, public works, utilities things like that. so, exactly what wires were cut and what they went to, i don t know. reporter: and no materials such as wiring or metal are missing. police say it appears to be malicious mischie