♪ call me bin laden i'm a terrorist threat ♪ ♪ so my guns is quick to blow just like eliott ness ♪ >> hit that [ bleep ]. >> when it comes to staff threats, we take them seriously and do everything we can to collect all the information we can. definitely in light of recent events at other institutions -- we always take staff threats seriously. and we're going to act on them. >> 17 news at 5:00. >> two inmates stabbed three tehachapi prison guards in what's being described as a violent attack. following the attack, all state facilities went into immediate lockdown. authorities saying it won't be lifted until they're sure this incident was an isolated one. >> ever since the incident at tehachapi against officers, corcoran has been on full alert, searching cells and shaking down inmates to prevent similar attacks in their own prison.