Officials say they're still hopeful they'll find survivors in the rubble of collapsed Florida condo building

• Emergency responders continue to search for survivors following a 12-story building collapse in Surfside, Fl.
• Miami-Dade Mayor Daniella Levine Cava said officials "still have hope" survivors will be found.
• Four people were found dead; 159 people are still unaccounted for, officials said.

Officials said Friday that they are still hopeful that survivors will be found from the rubble of the collapsed 12-story condo building in Surfside, Florida.

"We will continue search and rescue because we still have hope that we will find people alive," Miami-Dade Mayor Daniella Levine Cava said at a press conference.

"That is exactly why we are continuing," Cava said. "That is why we are using our dogs and our sonar and our cameras, everything possible to seek places where there may still be people to be found."

A massive wing of the oceanfront Champlain Towers South condo outside of Miami suddenly collapsed early Thursday at around 1:30 a.m.

The death toll has now risen to four with 159 people unaccounted for, Cava said Friday.

"I want to be very clear about the numbers," Cava warned. "They're very fluid."

This story is developing. Please check back for updates.