A 7-year-old boy was killed and three others seriously injured in a residential structure fire in Joshua Tree on Thursday, officials said. The fire broke out at 12:17 p.m. in a home in the 62200 block of Crestview Drive, officials with the San Bernardino County Sheriff's Department reported on Facebook on Friday. The other victims were an 8-year-old girl and two women ages 33 and 67, officials said. The four residents of the home were found and pulled from the fire by citizens and San Bernardino County fire personnel before the deputies arrived, officials said. All four were taken to an area hospital where the 7-year-old was pronounced dead, officials said.