Divers have reported seeing the fuselage and engines of a crashed Lion Air plane on the seabed, and a ping locator has detected a signal which may be from the cockpit voice recorder, Indonesia's search and rescue chief has said.

The brand new Boeing 737 MAX 8 jet plunged into the Java Sea early on Monday, just minutes after taking off from the Indonesian capital. Jakarta, killing all 189 people on board.

Speaking on Saturday, the sixth day of the search, Muhammad Syaugi said "two engines and more landing gear have been found".

Lion Air plane crashes minutes after take-off from Jakarta Show all 13 1 /13 Lion Air plane crashes minutes after take-off from Jakarta Lion Air plane crashes minutes after take-off from Jakarta Indonesia President Joko Widodo inspects the items recovered from Lion Air flight JT 610 Getty Lion Air plane crashes minutes after take-off from Jakarta A member of Indonesian Search and Rescue Agency inspects debris AP Lion Air plane crashes minutes after take-off from Jakarta Rescue teams have been joined by fisherman and volunteers in the search for survivors Getty Lion Air plane crashes minutes after take-off from Jakarta Lion Air CEO, Edward Sirait (centre) speaks during a press conference at Lion Air Branch office at Soekarno Hatta Airport EPA Lion Air plane crashes minutes after take-off from Jakarta No bodies have yet been discovered among the wreckage of the Lion Air flight EPA Lion Air plane crashes minutes after take-off from Jakarta Indonesian search and rescue personnel prepare for a recovery mission Getty Lion Air plane crashes minutes after take-off from Jakarta Rescuers searching the site of the plane crash lift a body bag onto a nearby vessel EPA Lion Air plane crashes minutes after take-off from Jakarta A relative of passengers arrive at Lion Air's crisis center at Soekarno-Hatta International Airport in Tangerang, Indonesia AP Lion Air plane crashes minutes after take-off from Jakarta In this photo released by Indonesian Disaster Mitigation Agency rescuers inspect debris believed to be from a Lion Air passenger jet AP Lion Air plane crashes minutes after take-off from Jakarta A relative of passengers prays as she and others wait for news on a Lion Air plane that crashed off Java Island AP Lion Air plane crashes minutes after take-off from Jakarta A rescue team member points to the location where Indonesia's Lion Air flight JT 610 had crashed into the sea, at Tanjung Priok seaport in Jakarta Getty Lion Air plane crashes minutes after take-off from Jakarta Officials evacuate a body bag containing the remains of one of the victims of the crash EPA Lion Air plane crashes minutes after take-off from Jakarta Indonesian relatives of the plane crash victims cry as they wait for the news at the airport in Sukarno Hatta Airport EPA

"I haven't seen it myself but I got information from some divers that they have seen the fuselage," he said at a news conference at a Jakarta port where body bags, debris and passenger belongings are first taken.

The flight data recorder was recovered on Thursday and Mr Syuagi said a "low ping signal" was detected by a sonar locator that could be the black box voice recorder.

Divers and a remotely operated vehicle have been searching the suspected location since Saturday morning.