A catastrophic roof collapse at a nightclub in the Dominican Republic’s capital left at least 66 people dead, including a popular singer, a provincial governor, and former Major League Baseball pitcher Octavio Dotel, authorities said on Tuesday.

Some 155 people were injured and emergency crews were still working to pull survivors from the rubble of the Jet Set nightclub as families of the victims gathered at the site searching for their loved ones.

The emergency crews’ capacity was increased as “more heavy equipment has been used to speed up the removal of debris and continue the search efforts,” presidential spokesperson Homero Figueroa said in an afternoon statement.

Juan Manuel Mendez, head of the Dominican Republic’s emergency operations center, said earlier on Tuesday that the exact number of people inside the club at the time of the collapse remained unclear.

The disaster struck during a concert by popular Dominican singer Rubby Perez, who was among those killed, according to his manager and family members near the site. The event was attended by politicians, athletes and other prominent figures.

Also among the victims was Nelsy Cruz, the governor of the northern Monte Cristi province, President Luis Abinader said. Cruz was the sister of former baseball player Nelson Cruz, a seven-time Major League Baseball All-Star.

Former MLB players Octavio Dotel and Tony Blanco also died in the collapse, local authorities confirmed. Dotel died en route to a local hospital after being pulled from the debris, a spokesman for the nation’s sports ministry said.

Dotel, 51, debuted for the New York Mets in 1999 and played until 2013 for more than a dozen teams including the Houston Astros, Oakland A’s, New York Yankees, Chicago White Sox and Detroit Tigers.

“Thinking about our people in the Dominican Republic,” Carlos Mendoza, manager of the Mets, said in a press conference. “We have a lot of the Dominican community in the baseball world.”