Police in Petaluma are investigating an altercation between protesters and a pickup truck during Saturday’s “No Kings” demonstration in town, the department said.

According to police, at one point during the event, a group of protesters entered a crosswalk at the intersection of Western Avenue and Petaluma Boulevard North and were there while the signal displayed a green light for vehicles.

“A truck proceeded through the intersection at that time, resulting in a situation that understandably sparked strong concern in the community,” the Petaluma Police Department said in a news release.

According to one witness on Facebook, the pickup allegedly “plowed into” the protesters.

No injuries were reported and the involved driver reported what happened to police, the department said. The driver is also cooperating with the investigation.

Investigators are reviewing video footage and witness accounts to see if anything illegal happened, the department said.

Police said the No Kings event drew hundreds of participants and remained peaceful for the majority of the day.

The department pointed out that even with a green light, drivers are legally obligated to yield to any pedestrians in a crosswalk.

“Driving toward pedestrians, particularly families with children, is dangerous and may violate multiple sections of the California Vehicle Code,” Petaluma Police said.

Pedestrians also have a responsibility to cross the street lawfully and avoid walking against the light, especially outside of crosswalks, the department added.

Katy St. Clair got her start in journalism by working in the classifieds department at the East Bay Express during the height of alt weeklies, then sweet talked her way into becoming staff writer, submissions editor, and music editor. She has been a columnist in the East Bay Express, SF Weekly, and the San Francisco Examiner. Starting in 2015, she begrudgingly scaled the inverted pyramid at dailies such as the Vallejo Times-Herald, The Vacaville Reporter, and the Daily Republic. She has her own independent news site and blog that covers the delightfully dysfunctional town of Vallejo, California, where she also collaborates with the investigative team at Open Vallejo. A passionate advocate for people with developmental disabilities, she serves on both the Board of the Arc of Solano and the Arc of California. She lives in Vallejo.