Staff and councillors were evacuated from County Hall in New Road Oxford this morning after a burnt croissant triggered a smoke alarm.
A full meeting of councillors was interrupted at 11.45am and the building was emptied as a precaution.
The smouldering croissant was located in a microwave oven in a kitchen area outside the office of chief executive Joanna Simons, according to chief fire officer John Parry.
A building manager dealt with the incident and firefighters were not called.
Councillors and staff were forced to remain outside the building for about 15 minutes.
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