"At the last 12 hours, we found some more people. Unfortunately, they are not alive", Vach said.
The rescuers on the scene also found new tunnels inside the rubble overnight and more bodies while working in the space between the collapsed balconies, Vach said.
"These tunnels that we found right now were almost the first to be big enough to enable people to stay between them. Most of the collapse is very, very tight. The collapse was major".
Vach added there was only "very minor" hope of finding any survivors under the ruins of the collapsed 12-story building.
On Tuesday, Miami-Dade County Mayor Daniella Levine Cava told reporters the death toll in last Thursdays' collapse of the Surfside, Florida, apartment building had increased to 12, with 149 people still unaccounted for.