SURFSIDE, Fla. >> The death toll in the collapse of a Miami-area condo building rose to 78 today, a number the mayor called “heartbreaking” as recovery workers toiled for a 16th day to find victims in the rubble. Another 62 people remain unaccounted for.

Miami-Dade Mayor Daniella Levine Cava said the work to recover victims was “moving forward with great urgency” in order to bring closure to the families of victims who have spent an agonizing two weeks waiting for news.

“This is a staggering and heartbreaking number that affects all of us very deeply,” she said of the latest death toll.

Rescue workers and emergency support teams from Florida and several other states have labored in 12-hour shifts, 24 hours a day, physically and emotionally taxing work performed amid oppressive heat and in dangerous conditions.

“We know that there will be long-term impacts for the teams on the front line,” Levine Cava said. “They have given so much of themselves in these first two weeks.”

Miami-Dade Fire Chief Alan Cominsky said taking care of the mental health and well-being of the first responders is a priority. He said it is critical that the first responders communicate with each other. “It’s important for us to talk,” he said.

To that end, Levine Cava said officials have added peer support personnel at the fire stations.

No one has been found alive since the first hours after building fell on June 24.

The painstaking search for survivors shifted to a recovery effort at midnight Wednesday after authorities said they had come to the conclusion that there was “no chance of life” in the rubble of the Champlain Towers South condo building in Surfside.

Hope of finding survivors was briefly rekindled after workers demolished the remainder of the building Sunday night, allowing access to new areas of debris. Some voids where survivors could have been trapped did exist, mostly in the basement and the parking garage, but no one was found alive. Instead, teams recovered more than a dozen additional victims.

On Thursday, Paraguay’s foreign minister said in a radio report that the body of the sister of that country’s first lady was among those found. Several Latin American citizens were reported in the building when it collapsed. Rescue workers now focused on finding remains instead of survivors have pledged to keep up their search for victims until they clear all the debris at the site.

State and local officials have pledged financial assistance to families of the victims, as well as to residents of the building who survived but lost all their possessions. Meanwhile, authorities are launching a grand jury investigation into the collapse. And at least six lawsuits have been filed by families.