Horsham Crime Investigation Unit Detective Senior Constable Neale Roberts said offenders lit a fuel container in Ashwin Close about 11.45pm.

“Someone or multiple people have placed a red five or 10-litre fuel container with petrol in it on a brick letterbox and ignited it,” he said.

“The explosion destroyed the letterbox.

“We are calling for anyone who saw it or anyone in the vicinity of Ashwin Close at that time to call Horsham Police Station or Crime Stoppers.”