Indonesia National Transport Safety Committee chief Soerjanto Tjahjono on Sunday said that the location of the two black boxes of the crashed jet, also known as flight data recorders, has been identified after nearly a day of searching, reported AFP.

“We have located the position of the black boxes, both of them,” said Soerjanto Tjahjanto, head of Indonesia’s transport safety agency.

“Divers will start looking for them now and hopefully it won’t be long before we get them,” he added.

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Earlier in the day, a military vessel picked up the plane’s signal, and divers recovered wreckage from around 23 metres below the water’s surface, the transport ministry of Indonesia said, citing Indonesia’s military chief Hadi Tjahjanto.

The Sriwijaya Air Boeing 737-500 went into a steep dive about four minutes after it left Soekarno-Hatta international airport in Jakarta on Saturday afternoon.

Indonesia’s President Joko Widodo expressed his “deep condolences”, and called on citizens to “pray together so that victims can be found”.

The search and rescue agency said it had so far collected five body bags with human remains as well as debris from the crash site.

All 62 people on board, passengers and crew, were Indonesians, including 10 children, authorities said.

Flight SJ182 was bound for Pontianak city on Indonesia’s section of Borneo island, about 90 minutes flying time over the Java Sea.

The plane crashed near popular day-trip islands just off the coast.

The transport minister said Saturday that the jet appeared to deviate from its intended course just before it disappeared from radar.

Poor weather, pilot error or a technical problem with the plane were potential factors, said Jakarta-based aviation analyst Gerry Soejatman.