A 47-year-old man has been apprehended in connection with the discovery of several homemade explosive devices on the Hawaiian island of Maui, according to law enforcement officials.

Robert Francis Dumaran made his first court appearance in Hawaii on Tuesday, according to the U.S. Attorney's Office for the District of Hawaii. Dumaran faces charges of possessing an unregistered destructive device and trying to cause damage to property using an explosive, based on an unsealed criminal complaint.

The U.S. Attorney's Office said Dumaran's preliminary hearing is scheduled for August 27. He is being held without bail, the office announced.

Authorities stated that they've been dealing with a series of homemade bombs, classified as IEDs by the FBI, found on Maui, hidden in trash cans and other locations disguised within baskets. There have been numerous explosions on the island over the past week attributed to these devices, according to authorities.

The first IED was discovered on July 23 by Maui Police Department officers responding to a report about a suspicious item near Kahului Elementary School. The bomb was made using explosive powder, a battery, and shrapnel. Investigators reported finding Dumaran's fingerprints on "clear packing tape" used in its construction.

The unsealed complaint mentioned that "multiple IEDs" with similar designs were detonated along Kaamana Street in Kula, Hawaii, on August 7. Another device exploded on August 8, damaging a passing car. A third device was attached to a guardrail before detonating and "caused significant damage to the guardrail and surrounding area," according to the complaint.

The criminal complaint states that the investigation is ongoing, and Dumaran might face additional charges.

Dumaran has been the subject of previous investigations, according to investigators. The legal document states that police searched his residence in January 2022 and uncovered custom fireworks, ammunition, and other materials that could be used to construct homemade explosive devices. It was during this search that authorities obtained his fingerprints, the document states.

Fingerprint evidence and cell tower data played a key role in the police investigation, authorities revealed. Dumaran's mobile phone was found to be in the vicinity of Kahului Elementary School on the day the explosive device was found there, as well as near Kaamana Street several days before devices were discovered at that location, according to the legal document.

The unsealed legal document details Dumaran's written conversations with an unidentified third party. In these exchanges, the defendant allegedly states that he intended to detonate explosives to "make me feel better."