Four men and two teenage boys have been charged following a shooting in Tallawong in Sydney's northwest, with police seizing seven firearms, ballistic vests, cloned number plates and thousands of rounds of ammunition across arrests in Old Toongabbie, Guildford and Rouse Hill. A new search for Malaysian Airlines flight MH370 begins more than a decade after its disappearance, using autonomous underwater robots from Ocean Infinity to map the seafloor in an area the size of metropolitan Sydney. The underwater vehicles will use synthetic aperture sonar technology to search depths over 1,000 metres where underwater canyons, mountains and valleys complicate detection efforts.