A search warrant was served on staffing firm Loyal Source at its office in Orlando, Fla., on Aug. 3, according to the US Attorney’s Office. As of today, the search warrant remains sealed and no further information is available from the office.

The Orlando Sentinel newspaper earlier this month reported that medical and technology professionals placed by the company received an email from the company saying it was under investigation but that contracts remained in place, its offices were fully operational and that it was confident the investigation would conclude quickly and with no violations.

Loyal Source topped the list of fastest-growing US staffing firms for the last two years and this year ranked in the top 10 in terms of growth.