A series of arson fires has occurred at city parks in Cambridge, targeting portable toilets. This has led to an investigation by the police, as stated by city officials. The fires are being taken seriously by investigators due to their potential danger.

The city has responded to the incidents by removing the portable toilets from the parks. Further details about the investigation and the incidents are available from city officials and the police. For more information on the arson fires and the investigation, readers can refer to the source for updates and additional details.