(Portland, OR) -- Illegal street racing involving more than 100 cars broke out across Portland early Sunday morning, just hours after police wrapped up a 10-hour enforcement mission. The Portland Police Bureau said the operation led to 29 traffic stops, six vehicle tows, and two arrests, but large racing events quickly followed in St. Johns, the Lloyd District, and other neighborhoods. Officers said they were stretched thin responding to other emergencies, leaving limited resources to confront the gatherings. One driver was later cited for racing, and police seized a stolen firearm during the incident.