Mexico has invited experts from the U.S. National Transportation Safety Board to investigate a helicopter crash that killed the governor of the western state of Puebla and her husband.

Mexico’s assistant transportation secretary says the invitation was made “to leave no doubts” about the Monday crash that killed opposition Gov. Martha Erika Alonso and her husband, ex-Gov. Rafael Moreno Valle.

Carlos Moran said Tuesday that the manufacturers of the helicopter and its engines will participate in the investigation, and it was too early to determine whether mechanical problems played a role.

Two pilots and a third passenger also died in the crash. The pilots were described as experienced, though one had spent much of his career flying fixed-wing aircraft.

Alsonso, 45, had only been sworn into office ten days ago after independent electoral authorities dismissed the challenge.

Mexican governor Martha Erika Alonso (right) was killed in a helicopter crash Monday alongside her spouse Rafael Moreno Valle Rosas (left)
Mexican governor Martha Erika Alonso (right) was killed in a helicopter crash Monday alongside her spouse Rafael Moreno Valle Rosas (left)

Meanwhile her husband Valle was also the former Puebla governor and a prominent figure in the opposition National Action Party who had vied unsuccessfully for the party’s presidential nomination and its internal leadership. The couple did not appear to have children.

President Andres Manuel Lopez Obrador expressed his “deepest condolences” via Twitter to the family of Gov. Martha Erika Alonso and ex-Gov. Rafael Moreno Valle on Monday evening. He added that authorities would investigate the cause of the crash.

Marko Cortes, president of the couple’s National Action Party, tweeted that he deeply lamented the fatal accident.

The aircraft went down in Huetjotzingo, a small city near the second largest in Mexico, Puebla
The aircraft went down in Huetjotzingo, a small city near the second largest in Mexico, Puebla

It crashed in the municipality of Santa Maria Coronango, which is about 3.5 miles north of the city’s main airport on the western outskirts, federal Public Security Secretary Alfonso Durazo told a news conference.

Both federal and state officials said they had opened investigations into the cause — a potentially sensitive case because President Andres Manuel Lopez Obrador’s Morena party had challenged the validity of Alonso’s election in July. She was sworn in 10 days ago after independent electoral authorities dismissed the challenge.

State spokesman Maximiliano Cortazar demanded a “transparent, impartial and independent” investigation.

Relatives and friends touch the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. 25, 2018. (AP Photo/Marco Ugarte)
Relatives and friends touch the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends touch the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends surround the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends surround the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends touch the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends touch the urn with ashes of opposition Puebla state Gov. Martha Erika Alonso during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends stand next to an urn with ashes of Puebla state's ex-Gov. Rafael Moreno Valle, during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
Relatives and friends stand next to an urn with ashes of Puebla state’s ex-Gov. Rafael Moreno Valle, during a farewell ceremony in Puebla City, southeast of Mexico, Tuesday, Dec. (AP Photo/Marco Ugarte)
The couple did not appear to have children
The couple did not appear to have children

Source: The Associated Press & Daily Mail