Police are investigating two separate crime incidents involving organised criminal activity in Australian cities. In Sydney's Westmead, two vehicles were deliberately set alight with a fuel tank explosion sending burning petrol down the street. In Western Australia, organised crime syndicates including links to the Comancheros outlaw motorcycle gang are recruiting teenagers to firebomb convenience stores as part of a violent illicit tobacco trade war, prompting police to seize 3.9 million cigarettes worth $4.5 million and announce tighter laws to combat the growing criminal enterprise.