A loud explosive noise was heard before the start of a suspicious grass fire in Tuggeranong on Thursday.
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Police are investigating the fire, which was reported at about 2.10pm and which investigators believe was deliberately lit.
Police said a number of witnesses reported hearing a loud explosive noise prior to the fire.
The fire began in a grassed area next to Lake Tuggeranong Bridge, near Athllon Drive.
It was extinguished quickly by ACT emergency services, after which the scene was handed over to police.
Police are seeking witnesses to the incident. Anyone who saw anything suspicious in the area and has not yet spoken to police can contact CrimeStoppers on 1800 333 000 or via www.act.crimestoppers.com.au.