SYDNEY, April 22 -- Australia's internet watchdog raised fears on Wednesday that popular online gaming platforms such as Roblox and Minecraft were being used by "predatory adults" to target children.

The nation's eSafety Commission has sent legal notices to a host of the world's most popular gaming platforms, demanding they explain how they are working to stamp out dangerous content.

Australia is at the forefront of global efforts to protect children from online harm, enacting laws last year that ban teenagers under 16 from social media.

eSafety boss Julie Inman Grant said research had shown the vast majority of Australian children played some sort of online game.

"Predatory adults know this and target children through grooming or emb...