Reuters | A witness told Reuters she had seen a man stabbing a woman and other people sobbing.

The mayor said he has spoken with the Southern Poverty Law Center for guidance on how to handle events involving white supremacists.

The mayor said he has spoken with the Southern Poverty Law Center for guidance on how to handle events involving white supremacists.

CBS Boston | The mayor said he has spoken with the Southern Poverty Law Center for guidance on how to handle events involving white supremacists.