Both buildings were temporarily evacuated as a precaution.
Police say a man went into city hall and made a bomb threat. Then, he apparently left a back pack on the floor before leaving the building.
Officials gave the all clear at 2:00 p.m., and lifted the evacuations as no bomb was found.
City Hall has been evacuated based on a possible bomb threat and suspicious package. Suspicious person being detained by police.— Union City Police CA (@UnionCityPD_CA) October 25, 2017