Police are appealing for more information over two teenage girls who were spotted around the time of an arson attack at Bicester Leisure Centre on Sunday afternoon.
An industrial recycling bin was set alight just after 4.30pm.
Two girls aged between 15 and 16 years old were seen in the area.
Officers said the bins were close to buildings, and said the fire could have spread if it had not been noticed early.
Anyone with information should contact PCSO Val Allen on 101.