A children's electronic toy sent through the post caused a bomb scare in Ipswich on Friday morning.
Suffolk Police and bomb disposal experts were called to the main sorting office in Commercial Road just after 0300 BST.
A brown package was heard to be ticking.
A bomb disposal unit from Colchester was called to the scene and the building was evacuated.
After investigating details on the packaging, officers discovered the package contained a children's toy with the batteries left inside.