Police are still waiting for video from Waymo before deciding whether two teenagers accused of drinking alcohol and firing an Orbeez gun from inside one of the company’s self-driving vehicles could face additional charges, a San Mateo police spokesperson told KTLA.

The incident unfolded around 2:10 p.m. Monday when a Waymo representative contacted the San Mateo Police Department to report suspicious behavior inside one of the company’s autonomous vehicles.

“The Waymo rep who contacted us told us they saw what they described as a firearm in the vehicle, described it black in color, and at some point believed that the passengers were firing it outside of the vehicle,” Community Relations Officer Janine Luna said. “Even at one point saying they believed they saw a recoil.”

The representative also reported that the passengers appeared to be intoxicated and had an open bottle of alcohol inside the vehicle, Luna said.

Believing they were responding to reports of a firearm being fired from a moving vehicle, officers coordinated with Waymo to conduct what police described as a high-risk traffic stop.

Luna said Waymo remotely disabled the vehicle in a location where officers could safely respond. The company then informed the passengers that the vehicle was experiencing mechanical problems while officers made their way to the scene.

Although the vehicle was disabled, its doors remained unlocked and the passengers could have exited if they wanted to, Luna said. Instead, they stayed inside until officers arrived, cleared the vehicle and detained the occupants.

Investigators later determined the suspected firearm was an Orbeez gun, a motorized toy that fires water-filled gel pellets.

While Orbeez guns are legal to possess, Luna said the one recovered by officers had been partially painted black, making it appear more like a real firearm.

“We’ve been seeing that a lot, where people are taking BB guns, water guns, toy guns, completely painting them over, and then in a lot of cases they actually do really look like real guns,” she said.

Police said no injuries or property damage have been reported, and no victims have come forward.

The two passengers, both 15 years old, were released to their parents and were not arrested, Luna said.

Authorities have already forwarded the underage drinking allegation to the juvenile district attorney for review. However, investigators are still waiting to receive Waymo video before deciding whether to recommend any additional charges.

“We’re still waiting to receive that video to determine what, if anything, they’ll be charged with,” Luna said. “Obviously it’s a water gun or toy gun. It’s not illegal to carry, but depending on shooting from a moving vehicle, there’s some of that that can come into play.”

Luna said this was the first time the San Mateo Police Department had handled an incident in which Waymo contacted officers in real time to report suspicious activity inside one of its vehicles.

The incident comes just weeks after another high-profile Waymo incident in Southern California. In late June, several teens were seen hanging out of the windows of a self-driving Waymo as it traveled through Santa Monica traffic. Waymo later told KTLA those riders’ accounts had been suspended for violating the company’s user agreement.

Luna also urged parents to keep an eye on their children during summer break and reminded the public not to alter the appearance of toy guns to make them resemble real firearms.

“We want to give our kids freedom to have fun and enjoy their time off from school,” Luna said. “But because they’re not in school, just keep an eye on them. Make sure you know where they’re at. Make sure you know who they’re hanging out with.”

Iman Palm and Aaron Tolentino contributed to this report.