Georgia Tech said Wednesday it has hired two firms to review last week’s online security breach.

Mandiant, a Virginia-based firm, will investigate how the breach occurred and the method of attack. Ankura, which has offices in several cities, including Atlanta, will analyze what was taken, a Tech spokesman said.

The work is expected to take several weeks.

The school, recognized for its computer science curriculum, disclosed on April 2 a breach that potentially impacted 1.3 million students, faculty, alumni and staff. Officials feared the exposed information included names, addresses, social security numbers and birth dates.

The breach was traced to December, officials said. No evidence indicates any data was manipulated or corrupted during the incident, Tech officials said Wednesday.

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