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According to Business Travel News, medical and travel security services company International SOS recently acknowledged that one of its systems, which hosts traveler information related to one of the company's information technology products, was breached on August 28, 2013 (h/t DataBreaches.net).
"As soon as we were made aware of the incident, we immediately took steps to investigate and mitigate against further incidents, as well as notified the appropriate law enforcement authorities," the company said in a statement. "We have proactively communicated to a limited group of clients whose travelers' data may have potentially been accessed. This incident remains under investigation and we are committed to providing further updates to our clients."
While the company wouldn't say what data was compromised or how many clients were affected, Business Travel News notes that companies like International SOS generally work in cooperation with the client's travel management company, which usually exports the client's passenger names records in their entirety, though payment information is often masked.