In the early hours of August 5, 2020, a deliberately set fire destroyed a Denver home and killed five members of the Diol family. Victims included 23-year-old Adja Diol, her 29-year-old husband Djibril Diol, their 22-month-old daughter Khadija Diol, Djibril’s 25-year-old sister Hassan Diol, and Hassan’s infant daughter Hawa Beye. Three other occupants escaped by jumping from a second-story window.

Investigators traced the arson to three teenagers: Kevin Bui, 16 at the time; Gavin Seymour, 16; and Dillon Siebert, 14. The teens had allegedly targeted the house after Bui’s phone and money were stolen weeks earlier; Bui used a phone-tracking app and mistakenly identified the Diol address as the thief’s location. The three went to the house at night, doused the living room with gasoline, and set it on fire. Surveillance captured three masked people fleeing in a dark-colored sedan.

A Google search warrant helped identify users who had searched the victims’ address, leading to arrests in January 2021 and multiple charges including first-degree murder, attempted murder, and arson. Bui and Seymour were prosecuted as adults; Siebert was tried as a juvenile. Anyone with information about Adja Diol or the Diol family is asked to come forward.