Multiple members of a family in northern Mexico - including two infants - have been killed in an attack by unknown gunmen, local media say, with reports all of the dead are US citizens.
Authorities are investigating whether the killings were a case of mistaken identity, reports CNN.
Mexican media reported that the victims belonged to the LeBaron family, associated with a break-away Mormon community that settled in northern Mexico decades ago.
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Three women, four small children and two infants are believed to be dead.
The reports said the dead, as well as additional missing family members, may all be US citizens.
The governments of Chihuahua and Sonora states, both of which border the United States, issued a brief, joint statement late on Monday saying an investigation into the incident had been launched and that some people were presumed dead and others missing.
The statement, which noted that additional federal and local security forces were being sent into the area near the border between the two Mexican states, did not provide further details.
Local television showed images of a burnt-out vehicle that may have belonged to the family, and local activist and family member Julian LeBaron was quoted as describing the incident as a "massacre," adding that some family members were burnt alive.