A man carries a piece of debris on his head at the crash site of a Nairobi-bound Ethiopian Airlines flight near Bishoftu, a town some 60 kilometers southeast of Addis Ababa, Ethiopia, on March 10, 2019.

China, Indonesia, and Ethiopia grounded their Boeing 737 MAX-8 fleets on Monday while investigators found the black box from a crash that killed 157 people in the second disaster involving that airplane model in six months.

India's Directorate General of Civil Aviation (DGCA) also said it is reviewing safety issues related to Boeing's 737 MAX-8 aircraft operating in the country.

The DGCA said it would issue additional safety instructions later on Monday or Tuesday for Indian carriers operating the Boeing 737 MAX 8 planes in India. Full service carrier Jet Airways and low-cost carrier SpiceJet own and operate these aircraft in India.

The Ethiopian Airlines jet bound for Nairobi came down minutes after take-off from Addis Ababa on Sunday, killing all on board. The victims came from 33 nations and included 22 United Nations' staff.

The discovery of the black box with both the cockpit voice recorder and digital flight data, reported by Ethiopian state TV, should shed light on the cause of the crash.

At the scene, men in Red Cross jackets picked through the dirt, putting items in black paper bags, while investigators hunted for the black box voice recorders.

"Although we don't yet know the cause of the crash, we had to decide to ground the particular fleet as extra safety precaution," Ethiopian Airlines said. It has four other 737 MAX-8 jets, according to flight tracking website FlightRadar24.

The 737 line is the world's best selling modern passenger aircraft and viewed as one of the industry's most reliable.