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A team of U.S. aviation experts has arrived in Ethiopia to join an investigation into Sunday's crash of an Ethiopian Airlines jetliner that killed 157 people.

As questions grow about the new Boeing plane involved in the crash, the Federal Aviation Administration said late Monday it is at the crash site outside the capital, Addis Ababa, with representatives from the National Transportation Safety Board.

They join an Ethiopian-led investigation that includes authorities from neighboring Kenya and elsewhere.

The plane crashed six minutes into a flight to Nairobi and a growing number of countries and airlines have grounded the new Boeing 737 Max 8 jetliner as a result.

One witness has told The Associated Press that smoke was coming from the plane's rear before it crashed.