Work and Income offices in Linwood, Sydenham and Hornby in Christchurch have been closed after receiving threats.
A Ministry of Social Development spokesperson said police have been notified.
Earlier the Hornby WINZ office was closed after a threat was made to staff.
It's thought the threat was made over the phone.
Riccarton Wigram Community Board Chairman Mike Mora said he was at the Hornby branch when it was closed.