The Internet messaging system shut down part of its service after the hacking was discovered Sunday because of what the Charleston, S.C.-based company described as a "vulnerability" in the mobile posting system.
Twitpic Inc. said to disregard a message from Spears' account that incorrectly said the singer had died, and they were "implementing a fix immediately."
Twitpic is a program that allows users of Twitter to share photographs. It is not owned by Twitter Inc.
Emails to Noah Winecoff at Twitpic and the press office at San Francisco-based Twitter were not immediately returned Sunday.
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