Indonesian authorities said they have found the location where they believe a Boeing 737 passenger plane crashed into the sea shortly after take-off from the country’s capital, Jakarta, on Saturday.
The Sriwijaya Air jet was carrying 62 people when it disappeared from radar four minutes into its journey to Pontianak in West Kalimantan province.
On Sunday, signals thought to be from the jet’s flight recorder were traced.
More than 10 ships have now been deployed to the site with navy divers.
“We have detected signals in two points, this could be the black box,” the chief of Indonesia’s search and rescue agency, Bagus Puruhito, said.
Investigators are also analysing items they believe to be wreckage from the aircraft, including a wheel and what they say could be part of the plane’s fuselage.
A spokesman for the Jakarta police, Yusri Yunus, said two bags had been received from the search and rescue agency.
“The first bag contained passengers’ properties, another bag contained body parts,” he told reporters, adding: “We are still identifying these findings.”
Search and rescue efforts were suspended overnight but resumed early on Sunday. Four planes have also been deployed to help with the search.
The Sriwijaya Air passenger plane departed Jakarta airport at 14:36 local time (07:36 GMT) on Saturday.
Minutes later, at 14:40, the last contact with the plane was recorded, with the call sign SJY182, according to the transport ministry.
The usual flight time to Pontianak, in the west of the island of Borneo, is 90 minutes.
The aircraft did not send a distress signal, according to the head of national search and rescue agency Air Marshal Bagus Puruhito.
It is thought to have dropped more than 3,000m (10,000ft) in less than a minute, according to flight tracking website Flightradar24.com.
Witnesses said they had seen and heard at least one explosion.
There were thought to be 50 passengers – including seven children and three babies – and 12 crew on board, though the plane has a capacity of 130. Everyone on board was Indonesian, officials say.
Relatives of the passengers have been waiting anxiously at the airport in Pontianak, as well as at Jakarta’s Soekarno-Hatta International Airport.
The missing aircraft is not a 737 Max, the Boeing model that was grounded from March 2019 until last December following two deadly crashes.
According to registration details, the plane was a 26-year-old Boeing 737-500.
It was in good condition, Sriwijaya Air chief executive Jefferson Irwin Jauwena told reporters. Take-off had been delayed for 30 minutes due to heavy rain, he said.
Sriwijaya Air, founded in 2003, is a local budget airline which flies to Indonesian and other South-East Asian destinations.