A hacker who recently gained access to Twitter accounts belonging to a top executive of the major technology company has used it to gain access to personal information including credit card numbers and Snapchat account passwords, the New York Times reported.
The company said the breach affected more than a dozen accounts, and affected employees at several companies.
The information was not revealed by Twitter until Wednesday.
The company said in a statement that it is cooperating with law enforcement and has begun a comprehensive review.
The breach comes at a time when Twitter has become increasingly popular with people trying to keep tabs on the news and communicate with friends.
The service offers news, videos, photos, news feeds and more, with people posting about topics ranging from the weather to politics, social justice and more.
It is unclear if the accounts were accessed by a single person or a group of users who were all connected to one another.
Twitter declined to comment on the extent of the breach, but said in the statement that the breach affects more than 1 million people.