Police say an anonymous source reported overhearing some guys talking "about the pickup of a package containing firearms" in that area.
Officers are first set up surveillance of the alley, but decided they couldn't just let a bunch of guns in a bag sit there, even if under surveillance.
On opening the bag, police say, they found: A Smith & Wesson .45 caliber firearm, Model 457 with magazine; Smith & Wesson .357 caliber revolver, Model 65-3; Bryco Arms .380 automatic firearm, Model 38 with magazine; Bauer .25 caliber firearm with magazine; Taurus .40 caliber firearm with two magazines and a box of 20 Federal Premium .45 caliber rounds of ammunition.
Are they yours? Police would love to talk to you. If you know who might be just leaving bags of guns around the community, contact detectives at 617-343-4712 or the anonymous tip line by calling 800-494-TIPS or by texting TIP to CRIME (27463).
Suffolk County DA Dan Conley thanked the anonymous tipster:
Thereâ€™s no question that this tipster saved a life. We appreciate every call that helps identify an offender in the aftermath of violence, but this unknown hero stopped a crime before it happened. Whoever you are, your city thanks you.