CIUDAD JUAREZ, Mexico (AP) — Grieving neighbors and friends are struggling to understand the horrific killing of eight members of a religious family, including three young children — a massacre that prosecutors in this Mexican border city say was over a $115 debt the father couldn’t repay.

Church elders said they never heard anything about Romero Sanchez’s family having any problems.

Authorities arrested two suspects Tuesday after investigators found traces of blood on their clothing, assistant Chihuahua state prosecutor Enrique Villarreal Macias said. DNA tests were ordered as well as samples taken from the victims’ fingernails.

There was no clear explanation why the young children were killed, although prosecutors speculated that because the suspects lived nearby and one of them knew the family, they may have feared the children could identify.

Investigators appear to have all but ruled out druggang involvement in the killings in a city that has suffered years of cartel violence.

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