The Mexican security minister stated Tuesday that nine people, three women and six children, have been killed in an ambush on a Mormon family in Northern Mexico.
The official further stated that the murdered people travelling in a convoy, could have been confused with criminal groups fighting for control in the region.
US President Donald Trump has turned to Twitter amid the ongoing investigation to lambast those responsible for the crime and to propose US support for Mexico.
Commenting on Trump's proposal, Mexican President Lopez Obrador said that his country was ready to work with the FBI in the war against drug cartels.
Earlier in the day, media said the Mexican authorities had deployed national police and military forces to the northern state of Sonora bordering the US following reports of at least seven US citizens, including children having been killed.
The reports of the massacre emerged late on Monday as Lafe Langford Jr, a member of the Church of Jesus Christ of Latter-day Saints, which has a major presence in the region, posted a statement on Facebook, saying that a mother and four of her children had been killed by drug cartels.
According to Mr Lafe Langford Jr, Rhonita Miller and her 4 children were shot up and burned to death in a vehicle.
Mr Lafe Langford Jr has been updating the information as the situation develops, saying that two other women who were previously missing - Christina Langford and Dawna Langford and their children have also been killed.