Investigators start studying Ethiopian jet's voice recorder

This aerial image made from video shows recovery work continuing at the scene where the Ethiopian Airlines Boeing 737 Max 8 crashed shortly after take

This aerial image made from video shows recovery work continuing at the scene where the Ethiopian Airlines Boeing 737 Max 8 crashed shortly after take

In this photo taken Thursday, March 14, 2019, sister Goreti Kimani consoles brother Chira Kageche at a memorial service for their brother, Catholic pr

In this photo taken Thursday, March 14, 2019, sister Goreti Kimani consoles brother Chira Kageche at a memorial service for their brother, Catholic pr

In this photo taken Thursday, March 14, 2019, Father Michael Wa Mugi lights a candle and signs the book of condolence next to a photo of Catholic prie

In this photo taken Thursday, March 14, 2019, Father Michael Wa Mugi lights a candle and signs the book of condolence next to a photo of Catholic prie

Two United Nations security officers stand beside a memorial wreath during a ceremony at United Nations headquarters, Friday March 15, 2019, for U.N.

Two United Nations security officers stand beside a memorial wreath during a ceremony at United Nations headquarters, Friday March 15, 2019, for U.N.

PARIS (AP) — Investigators have started studying the cockpit voice recorder of the crashed Ethiopian Airlines jet.

The French air accident investigation agency BEA tweeted that technical work on the recorder began Saturday. The BEA also said work resumed on the flight's data recorders.

The recorders, also known as black boxes, were sent to France because the BEA has extensive expertise in analyzing such devices. Experts from the U.S. National Transportation Safety Board and the plane's manufacturer Boeing are among those involved in the investigation.

In Ethiopia, forensic DNA work has begun on identifying remains. Local media report that it may take six months to identify the victims' remains, although death certificates should be issued in two weeks. The 157 who died in Sunday's crash came from 35 countries.