By Kalhan Rosenblatt and The Associated Press

Twenty evangelical priests are among more than 100 people killed when a plane crashed outside of Havana on Friday, according to The Associated Press.

“On that plane were 10 couples of pastors. 20 people. All of the Nazarene Church in the eastern region,” confirmed Maite Quesada, a member the Cuban Council of Churches.

The group spent several days at a meeting in the capital and were returning to their homes and places of worship in the province of Holguin.

On Saturday afternoon, the AP cited Cuba's Transportation Minister Adel Yzquierdo as saying that 110 people were killed in the accident. The minister said authorities were investigating the cause of the crash.

"We have the black box in our hands, in good condition," he said, according to Reuters.

Friday's crash, the worst in Cuba in nearly 30 years, happened at 12:08 p.m. ET, José Ramón Cabañas, the Cuban ambassador to the U.S., said on Twitter. After takeoff, the aircraft "rushed ashore" in an unpopulated area between the Boyeros and San Antonio de las Vegas areas of Havana, he tweeted.

Six crew members and a baby were also on board the flight, Cuban TV said.

On Saturday, flags flew at half-mast in Cuba, marking the start of two days of national mourning while authorities worked to identify the remains of those who died in the crash.