Suspicious envelope reported at Congresswoman Debbie Wasserman Schultz's Sunrise office, police say

A suspicious envelope was reported to have been sent to South Florida Congresswoman Debbie Wasserman Schultz's office in Sunrise on Monday, according to authorities.

The Sunrise Police Department said that a representative of Wasserman Schultz's office, located at 777 Sawgrass Corporate Parkway, reported receiving the envelope but did not open it.

According to Sunrise police, they secured the envelope safely, but its contents are unknown because it remains unopened.

Wasserman Schultz posted on social media confirming the incident with an image of the envelope in a post that reads: 

"Today, like other Members, my district office received a suspicious letter. I'm thankful Sunrise Police and first responders acted swiftly to ensure my staff's safety. Cowardly acts of intimidation like this will not work. They have no place in our politics and must be condemned." 

Chopper 4 was over the building where the congresswoman's office is, and a couple of Sunrise Fire trucks were seen outside.

The FBI did not confirm the incident, but sent a general statement to CBS News Miami when asked about it that reads: 

"The FBI and U.S. Postal Inspection Service are investigating a series of suspicious mailings sent to various addresses nationwide, including Secretary of State offices and their related election offices, and Congressional offices. Some of the letters contained an unknown substance, and we are working closely with our law enforcement partners to respond to each incident. We are also working with our partners to identify the individual or individuals responsible for the letters. The FBI and the U.S. Postal Inspection Service will continue to safeguard the public and secure elections for American citizens."

No additional information was released.