HIGHLAND PARK, Ill. (CBS) – Pro-Palestinian protesters held a nighttime demonstration outside U.S. Rep. Brad Schneider’s (D-Ill.) Highland Park office in the early hours of Saturday morning, sparking noise complaints and alarm among neighbors.

In a public alert, city officials said the Highland Park City Police Department dispatch center received about 30 noise complaints about people screaming near Woodland Road around 2:43 a.m. CBS 2 was told Assemblyman Schneider was not home at the time of the protest, but other family members were.

The city said officers arrived on the scene within minutes and saw about 40 protesters gathered on the sidewalk, carrying banners and chanting pro-Palestinian and anti-Semitic slogans over loudspeakers and drums. Videos on social media also showed noises that sounded like sirens.

Schneider's office said a red liquid that looked like some type of animal blood was poured onto the sidewalk.

Officials said officers immediately began de-escalating and dispersing the crowd, following safety measures appropriate to the size of the crowd and setting up a security perimeter around the protesting group to ensure the safety of neighbors who were outside. Officers also contacted the event organizer and informed them of city regulations regarding noise and safe gatherings.

At around 3 a.m., officers requested additional units to help manage the area and coordinate an immediate and safe dispersal. By 3:15 a.m., all protesters had left the scene.

Officers remained on scene for two more hours to conduct the investigation and ensure the safety of residents, authorities said.

The city of Highland Park said no arrests or citations were made. The city said the crowd dispersed peacefully.

An Instagram post showing the demonstration included the caption: “Chicago organizers wake up Brad Schneider at 2:30 a.m. to demand he refund UNRWA and end US-backed genocide.”

In the article, Direct Actions for Palestine criticized Schneider for Cutting funding for the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA)and for Congress's approval of military aid to Israel.

In March, Congress passed a comprehensive budget bill that included a one-year ban on direct funding for UNRWA – after Israel made allegations that some of its staff had The Hamas attack of October 7.

“We must hold him accountable for the deaths of over 45,000 Palestinians in Gaza,” Direct Actions for Palestine wrote on Instagram. “If Gaza doesn't get justice, you won't be able to sleep. This is just the beginning.”

This video was also posted on the social media of two other pro-Palestinian groups – American Muslims for Palestine (AMP) Chicago and Students for Justice in Palestine (SJP) Chicago.

The protest takes place just a few days before Highland Park prepares for two-year anniversary since the shooting at the Independence Day parade, in which a gunman opened fire, killing seven people and injuring dozens.

A spokesman for Representative Schneider’s office said:

“It is unfortunate that a group of people who hid their faces rather than seeking constructive dialogue with Congressman Schneider decided to taunt and intimidate a predominantly Jewish neighborhood on the Jewish Sabbath in the middle of the night. Even more disturbing is that they decided to harass a community preparing to mark the second anniversary of the mass murder in Highland Park, a shared tragedy fueled by hate. The Congressman is always happy to meet and sit with anyone. I encourage those who do not share his views to seek a conversation in the daylight rather than disrupting and traumatizing families in the darkness of night.”

Anti-Defamation League regional director David Goldenberg said he has spoken with local law enforcement and Schneider about the protest. The city of Highland Park said it has been in contact with Rep. Schneider.

Officials also announced that there would be additional patrols in residential areas and that places of worship would be closely monitored.

On the city of Highland Park's Facebook page, some residents complained about the city's response, or “the lack thereof,” as one person put it. Some residents were particularly upset that there were no arrests.