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Sports-focused streaming-video service FuboTV said a “criminal cyber attack” was responsible for a prolonged outage that prevented subscribers from viewing most of Thursday’s World Cup semifinals between France and Morocco.

“The incident was not related to any bandwidth constraints on Fubo’s part,” the company said . “We were instead the target of a criminal cyber attack.”

There was no indication that customer data was accessed or downloaded or that the hack was related to a ransomware attack. The company has retained security firm Mandiant to investigate the intrusion. A spokeswoman declined to immediately answer questions and said the company would provide an update once it had more information.