Update: 11.45am The security alert has been lifted, according to Gardaí.
Staff returning to the Apple facility in Hollyhill have confirmed that Apple have told them they can come back to work. The evacuation is over.
Gardaí began a full search and risk assessment which concluded at around 11.30am.
The Army Bomb Disposal Team was not required and the security risk was stood down.
Staff returned to work just before midday and they will be debriefed on the morning's events.
The threat did not affect Apple's third Cork facility which is located on the Model Farm Road.
Update: 11.15am Staff driving away from the Apple Hollyhill site are being warned on the way out that they will have to park outside the centre on return.
A threat was made via the Garda website at around 8am this morning and staff were evacuated from the sites at Lapps Quay and Hollyhill at around 10am.
Earlier: Four thousand workers at Apple in Cork have been evacuated this morning following a security alert.
Gardaí are conducting a search of both premises.
Apple staff say they haven't been told the reason for the evacuation, though they are aware of news reports that it's due to a bomb scare.— Joe Leogue (@JoeLeogue) January 18, 2016
Apple staff who were leaving the centre in Holyhill said they have not been told how long it will be until they can come back.
Outside Apple's centre in Holyhill, Cork which has been evacuated this morning. pic.twitter.com/ksPsH5rKIW— Joe Leogue (@JoeLeogue) January 18, 2016