The Pella Corporation’s headquarters in Pella were locked down for about two hours Tuesday (4/2) after an employee received a potential threat.  Pella Police say they were called around 10:20 about the threat. Corporation officials put their campus into lockdown mode.  A person of interest was found by Mahaska County Sheriff’s Deputies and law enforcement determined the threat wasn’t credible.  The lockdown was lifted around 12:50pm.