Probably from the new Fire Station.

No, it was not the fire station - I checked. Spaulding is constantly making noise for many many months now.

Thank you for reporting your concern to City of Cambridge via SeeClickFix. We have reviewed the information you provided our staff and will be investigating this issue further.

In the future, if you see this type of activity, we encourage you to call the Cambridge Police non-emergency number at 617-349-3300 and an available, nearby officer will be dispatched to the location. Tell us how we're doing by completing a short survey at www.surveymonkey.com/r/CambServiceRequests