Robert Francis Dumaran, Explosive Device and Powders, Hawaii 2024

A Maui man has pleaded guilty to possessing explosive powders and an unregistered destructive device, according to a press release from the United States Attorney’s office for the District of Hawaii.

Robert Francis Dumaran, 47, of Kahului, Maui, pleaded guilty in federal court on February 2, 2025 to possessing explosive powders as a convicted felon and possessing an unregistered destructive device.

According to court documents and information presented in court, Dumaran admitted he attempted to detonate a homemade firework at the intersection of Lono Avenue and Hina Avenue on Maui, Hawaii, during either the late evening of July 22, 2024, or the early morning of July 23, 2024.

The homemade firework contained black powder (gunpowder) and flash powder. As a convicted felon, Dumaran was prohibited from possessing explosives. The Maui Police Department discovered and rendered safe Dumaran’s homemade firework in the morning of July 23, 2024, as reported in a prior press release.

The Federal Bureau of Investigation later searched Dumaran’s residence and discovered an improvised hand grenade. Dumaran admitted he crafted and possessed that grenade for use as a defensive weapon capable of causing destruction and death.

Dumaran is not charged in connection with improvised explosive devices recovered on August 7, 2024 in Kula, Maui or the August 8, 2024 explosion in Pukalani, Maui.

The case was investigated by the Federal Bureau of Investigation and the Maui Police Department. Assistant U.S. Attorneys Jonathan D. Slack and Wayne A. Myers are prosecuting the case.