Evanston police say that an explosive device was found behind the Howard Street police outpost Saturday night.
Bomb technicians from the Cook County Sheriff's Department were called to the scene at 633 Howard St. and rendered the device inoperable.
Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives responded and assisted in the investigation.
Evanston Police Cmdr. Jay Parrott says a suspect taken into custody Saturday was turned over to federal authorities late this afternoon.
Charges have not yet been filed against the suspect, but Parrott says that based on a statement from the suspect and other evidence recovered, it appears the suspect acted alone and no additional explosive devices were planted.