Charges dropped

Prosecutors dropped the remaining charges yesterday against three Baltimore officers in the death of Freddie Gray, but stood by a medical examiner’s ruling that his death was a homicide. Gray, 25, suffered a severe spinal injury after he was shackled and loaded into a police van but not secured with a seatbelt in April 2015. His death a week later while still in police custody set off a series of sometimes violent protests in Baltimore and prompted ‘‘Black Lives Matter’’ demonstrations across the United States. Three officers were acquitted earlier this year, and another had been awaiting a retrial after his trial ended in a hung jury.