The front of the office building on Herschell Street in the Westchester Square section was splattered with red paint just after 12:40 a.m.
Campaign manager Oliver Hidalgo arrived at the office late Monday morning and acknowledged that it's not the first time staffers encountered a mess at the front door.
"We always have a lot of security concerns. We receive a lot of threats and so vandalism is not good to deal with, but I am happy that our team is safe," Hidalgo said.
Westchester Square resident Alice Solano says she's shocked something like this happened in the neighborhood.
"You can have your negatives about whatever it may be or what you are feeling, but to vandalize someone's office, I mean that's horrible," Solano said.
Police say vandals splattered red paint on the windows, door and roll-down gate. They also posted a sign reading "AOC funds genocide in Gaza."
The office was closed at the time and no arrests have been made.
Ocasio-Cortez was in Plattsburgh, New York, Sunday at a town hall with Rep. Paul Tonko at the time of the incident. She was expected in Queens later in the day to unveil a new accessibility ramp at the Jackson Heights Post Office, but security concerns prompted the congresswoman to cancel her appearance.
"It's not something unfamiliar to us, but basically having to deal with the reality of keeping her safe and other people safe at public events is always our top priority," Hidalgo said.
NYPD investigators are now closely examining any video recorded by cameras on the building's exterior as well as inside the office, in hopes of getting images that may identify the vandals and lead to an arrest.
"That's not acceptable, no way. I am so sad," said Gladys Santos, another Westchester Square resident. "I live in this neighborhood for 30 years and this is the first time I've seen such aggressiveness."
----------
* More Bronx news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube