 After authorities surveilled the suspect for a lengthy period and built their case, search and arrest warrants were executed.Because of the nature of The Bishop's alleged crimes—sending IEDs (improvised explosive devices) through the mail—the possibility that he could detonate an IED while being arrested was a major safety concern.After the arrest warrant was served, authorities in Dubuque evacuated part of an apartment complex when a bomb-sniffing dog stopped at a storage locker connected to the suspect.