That's just terrible news.
Sure, anyone storing massive amounts of value in a mobile wallet is always taking a high risk and already made the first mistake here.
Still, this usually hits crypto-newbies the hardest. Couldn't find anything, is there an approximate number of how many people are affected?

Will be interesting to see if this turns out to be an inside job or if it was "just" a bug exploited by someone. Many questions here, how and who...