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FORT LAUDERDALE (CBSMiami) – The Broward School Board building has been given the all clear after someone opened mail containing a mysterious white powder on Monday.

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Fort Lauderdale Fire Rescue and hazmat crews were called in investigate the substance.

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Chopper4 was over the scene at 600 SE 3rd Ave. as two hazmat crews entered the building.

The 10th floor of the building had been quarantined as they investigated.

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Crews have not said what the powder was, but they have given the all clear.