Here's what we know happened before the lockdown:
- These two suspects allegedly planted two bombs that killed three and injured over 170 others.
- These two suspects allegedly killed an MIT police officer.
- These two suspects allegedly carjacked an SUV and held its driver captive for some time.
- During a chase with police, these suspects allegedly threw homemade explosive devices at law enforcement.
What we don't seem to know yet (and definitely didn't at the time):
- Did they have more explosives? There's certainly reason to believe they may have.
- Did they have other attacks planned? We don't know one way or the other, and that's sort of the point.
I really don't think it's unreasonable that given what we knew, and especially what we didn't, residents of Boston (myself included) were asked to stay indoors while authorities attempted to locate suspect #2. Remember, they didn't lock the city down immediately after the bombing. They did it after what the Boston police commissioner is calling the "execution" of an MIT police officer, a carjacking, multiple IED detonations (or attempted detonations, I'm not totally clear), and a shootout with police in a residential neighborhood.