A joint police effort between two Orange County cities has led to the arrest of 10 suspects in a robbery series that spanned over six months, authorities said.

According to Anaheim and Placentia police departments, the 13 robberies occurred in Anaheim, Buena Park, La Habra, Orange, Placentia, Santa Ana, and Stanton between June and December of 2022. Victims were robbed while trying to sell property using online marketplaces and platforms.

The suspects reportedly carried a firearm during most of the cases, police said.

Authorities successfully identified the suspects involved and discovered that nine of the 10 suspects were Anaheim residents and members of a street gang in the city, police said.

Nine juveniles and one adult were arrested during the operation, and two firearms, narcotics, and stolen properties were discovered during search warrants, police said.

The suspects—including the adult who was 17 years old at the time of the crimes—were booked into the Orange County Juvenile Hall on suspicion of robbery and other charges, according to the authorities.

Police are urging potential victims of unreported robberies to come forward, as there may be more individuals affected.

Anyone with information about the robberies is asked to contact Placentia Police Department at 714-993-8113, Anaheim Police Department at 714-765-1466, or the Orange County Crime Stoppers at 855-TIP-OCCS.