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ELLIS COUNTY, Texas- Two pilots are dead after a helicopter crash Wednesday .

They were performing flight test operations on an experimental twin-engine Bell Helicopter 525 Relentless.

The names of the pilots have not yet been released and the cause of the crash is unknown at this time.

Bell Helicopter issued a statement:

On July 6, 2016, a Bell 525 was involved in an accident while conducting developmental flight test operations south of our Xworx facility in Arlington, Texas. Unfortunately, the accident resulted in a loss of two crew members. This is a devastating day for Bell Helicopter. We are deeply saddened by the loss of our teammates and have reached out to their families to offer our support. Bell Helicopter representatives are onsite to assess the situation and provide any assistance to local, state, and federal authorities. At this time we ask for your understanding as we work through all of the details. We will continue to provide updates as more information becomes available.