The death toll from the collapse of a Miami oceanfront apartment block has risen to three, ABC News reported, and nearly 100 people remained unaccounted for as rescue workers continued their search for survivors in the rubble. U.S. President Joe Biden approved an emergency declaration in the state of Florida and ordered federal assistance to supplement state and local response efforts. "The President's action authorizes the Department of Homeland Security, Federal Emergency Management Agency (FEMA), to coordinate all disaster relief efforts," the White House said on Friday. Rescue crews picked through tons of rubble on Thursday looking for survivors. Search…