Yahoo issues new warning of potential email account breach

LONDON — Yahoo is warning users of potentially malicious activity on their accounts between 2015 and 2016, the latest development in the internet company's investigation of a mega-breach that exposed 1 billion users' data several years ago.Yahoo confirmed Wednesday that it was notifying users that their accounts had potentially been compromised but declined to say how many people were affected.In a statement, Yahoo tied some of the potential compromises to what it has described as the "sta