ROMA, Texas -- The U.S. Customs and Border Protection says the CBP helicopter forced down in the Lower Rio Grande Valley had its main rotor damaged by a rock launched from the ground.

A CBP statement issued Thursday says the assailant who launched the rock Tuesday afternoon hasn t been identified.

The two-member crew of the American Eurocopter AS350 helicopter by was able to land the damaged aircraft safely without injury in a vacant lot in the border town of Roma.

The crew was from the CBP McAllen Air and Marine Branch was supporting Border patrol agents in Roma when it was downed.

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