Detectives have warned arsonists they risk seriously injuring themselves and endangering others.
It follows a spate of arson attacks over the past fortnight in Holyhead.
Most of the incidents have occurred on William Street where wheelie bins and wooden garage doors have been set on fire over the past two weeks. Another incident was reported on London Road.
Anyone with information about the arson attacks should contact Holyhead police station on 101 or the North Wales Police control room via the live web chat.