Brookline, surrounding areas not under attack, except maybe by clay disks flung into the air

Once again, people in Brookline and surrounding parts of Boston are reporting what sounds like repeated explosions. Shortly after 1 p.m., Mr. Jason asked:

Anyone hear random explosions in the Brookline Village/Mission Hill area?

Then, about an hour later, Hillary reported:

Still hearing it in JP - continual sets of two bangs at a time.

The answer, my friend, is shooting in the wind. Superguppy explains:

Probably skeet shooting over at The Country Club. Happens every weekend, get used to it peeps. #BlowingUpBrookline

And, sure, enough, a little Googling reveals that The Country Club features two skeet ranges (also: "A curling building with four sheets of ice").

Any other mysteries we can clear up? What, the costumed runners on Broadway in Cambridge? Molly reports that's the Boston Urban Iditarod, which, of course, takes place in Cambridge.