Indonesia believes it has located crashed jet's fuselage and black box

An Indonesian rescue team member points out the spot on a map where Lion Air flight JT610 crashed into the sea, at Tanjung Priok port in Jakarta, October 29. REUTERS/Willy Kurniawan

JAKARTA (Reuters) - Indonesian search and rescue workers believe an underwater "pinging" sound they have detected is from the black box of a passenger jet that crashed into the sea with 189 people on board, the country's military chief said on Wednesday.

Ground staff lost touch with flight JT610 of Indonesian budget airline Lion Air 13 minutes after the Boeing 737 MAX 8 took off early on Monday from Jakarta, on its way to the tin-mining town of Pangkal Pinang.