Primary Source
GANGS ROAM IN BOSTON
Thirteen persons were injured and scores taken into custody in the Roxbury, North Dorcester and South End areas of Boston, after a night of sporadic disturbances.
No one was hurt seriously, according to officials at Boston City Hospital.
At 3 a.m., police were unable to estimate how many people they had picked up or booked.
Police said property damage was most severe in the Grove Hall area and along Blue Hill Avenue in Roxbury. Most of it was caused by gangs of youths who were still roaming the area at 3 a.m.
At midnight after the gangs began stoning cars, police sealed off an area approximately two miles square around Grove Hall. All traffic except police patrols was diverted from Blue Hill Avenue, Warren Street, Quincy Street and other main arteries…
Mayor White went immediately to City Hall after hearing of Dr. King's death and remained there with key staff members through the night.
Police said the first reports of trouble in Roxbury came shortly after 9 p.m., as news of Dr. King's death spread throughout the area.
Boston Globe, April 5, 1968.