(NEXSTAR) – Thousands of Fidelity Investments customers may have had their personal information stolen amid a data breach that occurred in August of this year, according to the financial firm.

The breach took place between August 17–19, with Fidelity becoming aware of the activity on Aug. 19, according to a spokesperson for the company. Fidelity stopped access to the “third party” who had breached the accounts on the 19th, and subsequently launched an investigation “with assistance from external security experts,” the spokesperson said.

Fidelity has........

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