National Guard troops and police aimed to head off a third night of violence on Wednesday in Ferguson, Missouri, as more than 400 people have been arrested in the St. Louis suburb and around the United States in unrest after a white policeman was cleared in the killing of an unarmed black teenager.
There have been protests in Boston, New York, Los Angeles, Dallas, Atlanta and other cities decrying Monday's grand jury decision not to indict officer Darren Wilson in the Aug. 9 shooting death of 18-year-old Michael Brown in a case that has touched off a debate about race relations in the United States.
Ferguson, a predominately black city, has been hit by two nights of rioting, looting and arson with some businesses burned to the ground, but authorities say an increased security presence on Tuesday night helped quell the violence.