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.

Workers gather at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Workers gather at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)

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.

Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Framed photographs of seven crew members are displayed at a memorial service held by an association of Ethiopian airline pilots, in Addis Ababa, Ethiopia Monday, March 11, 2019. (AP Photo/Samuel Habtab)
Framed photographs of seven crew members are displayed at a memorial service held by an association of Ethiopian airline pilots, in Addis Ababa, Ethiopia Monday, March 11, 2019. (AP Photo/Samuel Habtab)
Parts of the plane wreckage with rescue workers at the crash site at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Parts of the plane wreckage with rescue workers at the crash site at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
A passenger passport lies on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
A passenger passport lies on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Documents lie on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Documents lie on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
A pile of debris on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
A pile of debris on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Airplane parts lie on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Airplane parts lie on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Rescue workers at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Documents lie on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
Documents lie on the ground at Bishoftu, or Debre Zeit, outside Addis Ababa, Ethiopia, Monday, March 11, 2019, where Ethiopia Airlines Flight 302 crashed Sunday. (AP Photo/Mulugeta Ayene)
A passenger passport lies on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
A passenger passport lies on the ground at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa,  Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
Rescuers work at the scene of an Ethiopian Airlines flight crash near Bishoftu, or Debre Zeit, south of Addis Ababa, Ethiopia, Monday, March 11, 2019. (AP Photo/Mulugeta Ayene)
In this image taken from video, rescuers search through wreckage at the scene of an Ethiopian Airlines flight that crashed shortly after takeoff at Hejere near Bishoftu, or Debre Zeit, some 50 kilometers (31 miles) south of Addis Ababa, in Ethiopia Sunday, March 10, 2019. (AP Photo/Yidnek Kirubel)
In this image taken from video, rescuers search through wreckage at the scene of an Ethiopian Airlines flight that crashed shortly after takeoff at Hejere near Bishoftu, or Debre Zeit, some 50 kilometers (31 miles) south of Addis Ababa, in Ethiopia Sunday, March 10, 2019. (AP Photo/Yidnek Kirubel)
Members of the Ethiopian community take part in a special prayer for the victims of the Ethiopian Airlines flight ET302 crash, at the Ethiopian Orthodox Tewahedo Church of Canada Saint Mary Cathedral in Toronto, on Sunday, March 10, 2019. (Christopher Katsarov/The Canadian Press via AP)
Members of the Ethiopian community take part in a special prayer for the victims of the Ethiopian Airlines flight ET302 crash, at the Ethiopian Orthodox Tewahedo Church of Canada Saint Mary Cathedral in Toronto, on Sunday, March 10, 2019. (Christopher Katsarov/The Canadian Press via AP)
This photo taken Monday, Feb. 11, 2019 shows an Ethiopian Airlines Boeing 737-800 parked at Bole International Airport in Addis Ababa, Ethiopia. (AP Photo/Ben Curtis)
This photo taken Monday, Feb. 11, 2019 shows an Ethiopian Airlines Boeing 737-800 parked at Bole International Airport in Addis Ababa, Ethiopia. (AP Photo/Ben Curtis)
Chart shows vertical speed of Ethiopian Airlines Flight 302 following takeoff.;
Chart shows vertical speed of Ethiopian Airlines Flight 302 following takeoff.;
Map shows path of Ethiopian Airlines Flight 302.;
Map shows path of Ethiopian Airlines Flight 302.;
Aviation authorities in China, Indonesia and Ethiopia have ordered airlines to ground their Boeing 737 Max 8 planes the day after one crashed in Ethiopia, killing all 157 people on board. (March 11)
Aviation authorities in China, Indonesia and Ethiopia have ordered airlines to ground their Boeing 737 Max 8 planes the day after one crashed in Ethiopia, killing all 157 people on board. (March 11)
Ethiopian pilots and flight crew held a mourning vigil on Monday for the victims of a Ethopian Airlines crash which killed all 149 passengers and eight crew members on board. (March 11)
Ethiopian pilots and flight crew held a mourning vigil on Monday for the victims of a Ethopian Airlines crash which killed all 149 passengers and eight crew members on board. (March 11)