Police responded to Congresswoman Debbie Wasserman Schultz's Sunrise office on Monday after a representative reported receiving a suspicious envelope, officials said.

Footage from Chopper6 showed Sunrise Police cars and fire rescue trucks at the offices at 777 Sawgrass Corporate Parkway.

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The contents of the envelope remain unknown, and it was safely secured and unopened, Sunrise Police said.

The incident comes as a federal investigation of letters containing unknown substances that were mailed to elected officials' offices widens, NBC News reported last week.

Several elected officials and election offices in several states have reported receiving suspicious packages.

Sources familiar with the investigation into the suspicious letters, which contain an unknown white powder substance, told NBC News that law enforcement has yet to trace the exact origins of the letters or the person or persons responsible for sending them.


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