Nephi massacre

The Nephi massacre was an 1853 incident when a group of Mormons invited a group of peace-seeking Goshute Native American men, children, and one woman into their fort in Nephi, Utah and executed the seven men and took the remaining three as prisoners. The settlers were acting in retaliation for the recent deaths of four Mormons in the Fountain Green massacre done by a different nation of Native American called Ute. The settlers were from the Church of Jesus Christ of Latter-day Saints commonly called Mormons.
The murder of the Goshute men occurred in the midst of a series of skirmishes dubbed Wakara's War between Native Americans and Mormons in the present-day Utah region. LDS settlers at Salt Creek Fort in present-day Nephi, Utah invited the group of people inside the fort, took them prisoner, shot them in the back of the head, and buried them in a mass grave. One woman and two children from the group were taken prisoner.

Accounts from local personal journals

Adelia Almira Wilcox, whose husband had been killed by Native Americans two weeks before, wrote in her memoir that those killed in the Nephi massacre were, "shot down without even considering whether they were the guilty ones or not.... They were shot down like so many dogs, picked up with pitchforks on a sleigh and hauled away."
According to another local woman:

Background

During the summer of 1853 violence erupted between Native Americans in what is now Utah Valley in Mormonism's largest denomination, the LDS Church. The series of killings were initiated over land and resource disputes. These conflicts are referred to as Wakara's War.

Mass grave discovery

In 2006 the remains of the slain Utes were discovered in an area of Nephi called Old Hallow during a construction excavation.