Vice's and TechCrunch's sources were corroborated from other security researchers who had been given similar screens, and tweets of these screens had been made, but Twitter removed these since they revealed personal details of the compromised accounts. Twitter subsequently confirmed that "We detected what we believe to be a coordinated social engineering attack by people who successfully targeted some of our employees with access to internal systems and tools."[1][24] In addition to taking further steps to lock down the verified accounts affected, Twitter said they have also begun an internal investigation and have limited employee access to their system administrative tools as they evaluate the situation.[25]