Dozens of rescuers in South Florida are searching for survivors this morning after an apartment building partially collapsed, prompting a massive emergency response.

Authorities say it is unclear how many people were inside the building at the time, but a firefighter on the scene could be heard saying there are multiple casualties.

“Over 80 MDFR units including #TRT (Technical Rescue Teams) are on scene with assistance from municipal fire departments,” Miami Dade Fire Rescue said in a tweet.

Firefighters pulled a boy from the debris and at least nine people were transported to the hospital.

The building address is 8777 Collins Avenue, according to Surfside police. The sea-view condo development was built in 1981 in the southeast corner of Surfside, on the beach. It had a few two-bedroom units currently on the market, with asking prices of $600,000 to $700,000.

Much of the building was occupied at the time of the collapse.

This is a developing news story and more information will be released at a later time.