Okay, the riot police are now in Kenmore Square.

[randomness]

There was a sea of people in the streets around Kenmore Square; then some moron decided to set something on fire in front of the McDonalds. Someone else picked up a trash can and threw it at the McDonalds, and now the riot police have arrived in a phalanx, backed up by fire engines (I'm guessing for water cannon).

It looks like the crowd is backing off, fortunately, up a couple of the avenues.