Police say a 37-year-old man groomed an Iowa teen he met on game platform Roblox, then drove her Tennessee, his home state, to sexually assault her.

The internet’s biggest recreation zone for kids is struggling to keep predators off its platform.

Roblox, an online game platform for adults and children, has an estimated 150 million monthly active users. After a BBC investigation raised concerns about some explicit content, experts share how ...