According to the BBC
, investigators from the Comores and France say the signal was picked up during an underwater search. Comoran lead investigator Ali Abdou Mohamed said in a statement that was received in Paris:
Investigators from the BEA [France's accident investigation agency] have detected a signal from the flight recorders.
No further information is available at present. It is also not known when the flight data recorders will be recovered.
Aircraft carry two flight data recorders, also called ”black boxes.” One records technical information from the aircraft itself while the other records voice messages from within the cockpit as well as messages sent and received by the aircraft’s radios.