A Baltimore Metropolitan Police transport vehicle burns during clashes in Baltimore, Maryland April 27, 2015. [Photo/Agencies]

With the Rev. Jesse Jackson sitting behind him, the Rev. Jamal Bryant gave a rousing and spirited eulogy for Freddie Gray, a message that received a standing ovation from the crowded church.

Bryant said Gray's death would spur further protests, and he urged those in the audience to join.

"Freddie's death is not in vain," Bryant said. "After this day, we're going to keep on marching. After this day, we're going to keep demanding justice."

Gray was arrested after making eye contact with officers and then running away, police said. He was held down, handcuffed and loaded into a van without a seat belt. Leg cuffs were put on him when he became irate inside.

He asked for medical help several times even before being put in the van, but paramedics were not called until after a 30-minute ride. Police have acknowledged he should have received medical attention on the spot where he was arrested, but they have not said how his spine was injured.