Heartbroken singer cries uncontrollably after bandmates are swept away by deadly tsunami

Four members of a boy band were killed after they were hit by a tsunami while playing onstage in Indonesia in a devastating natural disaster which was captured on film, Saturday evening.

The two band members and two members of crew died after they were swept away by a 20ft wave, which came crashing down on the stage.

Mere seconds before the wall of water hit the stage, a video showed the audience - which included families - enjoying a performance from the band, Seventeen.

Credit: Getty

In an emotional Instagram post, the band's lead singer, Riefian 'Ifan' Fajarsyah, broke down as he informed his 300,000 fans that his friends and band members had not been located.

"[We] lost Bani and our road manager Oki," the singer said. "Andi [drummer] and Herman [guitar] and Ujang [crew] have not been found. Please pray so that my wife Dylan [Dylan Sahara] will be found soon."

"The rest are thankfully safe although suffering from injuries and broken bones. Please pray so my wife Dylan, Andi and Herman and Ujang can be found soon."

In a statement that was later released by the group, it was confirmed that Awal 'Bani' Purbani, road manager Oki Wijaya, guitarist Herman Sikumbang, and crew member Ujang, were found dead.

They also revealed that two other band members and Ifan's wife have not yet been found.

According to local news sources, Ifan was swept out to sea before ultimately being saved by law enforcement officials.

Speaking to the press, he described the calamity he witnessed in the aftermath of the tsunami, and said that evacuation of the area is proving to be a slow, laborious process.

"Most of us, I and our manager are on the shore, including myself, when I was thrown into the middle of the sea, there were probably around 20 to 24 corpses around me," he said.

"Evacuation is very slow because there are many roads cut off and bad weather, heavy rain."

Seventeen were performing for 200 employees of state electricity utility, Perusahaan Listrik Negara (PLN), and families who had gathered at the Tanjung Lesung beach for an end-of-year party when the tsunami struck around 9:30pm on Saturday.

The wave hit beaches around the Sunda Strait, which is located between the islands of Java and Sumatra, destroying 500 houses, nine hotels and 350 boats.

The tsunami was triggered by an underwater landslide after the eruption of the Anak Krakatau volcano.

Currently, the death toll stands at 168, while more than 700 people are inured.

"Underwater I could only pray 'Jesus Christ help!'," Zack, a crew member of the rock band, wrote in an Instagram post describing his struggle in the water.

Credit: Getty

"In the final seconds I almost ran out of breath," he continued, saying that he was able to survive by clinging onto part of the collapsed stage.

Survivors were treated at clinics, but could not return to Jakarta because road access was blocked - said Yulia Dian, a manager for the band in Jakarta.

"We were shocked because a lot of the people who went there took their families," Dian stated, noting the band had been due to return to the capital on Sunday.

"They'd been sharing stories they were having fun at the beach and we didn't expect this."