HILO, Hawai'i — A 20-year-old University of Hawai'i-Hilo student was charged yesterday in connection with two small "bottle bomb" explosions on the Big Island campus.

Edward E. Wine, of Hilo, was charged with one count of first-degree terroristic threatening, Big Island police said. He was released pending further investigation.

No injuries or damage resulted from the Thursday morning blasts, and campus operations continued without disruption, according to Chancellor Rose Tseng. The Fire Department described the devices as one-liter plastic bottles containing "suspicious materials."

The suspect, a former Maui resident, was arrested Thursday afternoon after voluntarily presenting himself at the request of investigators.

The first bomb went off at 1:16 a.m. Thursday near Hale Kauanoe dormitory. While police were investigating the first explosion, another device went off near the Life Sciences building. Two of the bottle bombs — one detonated, the other not — were found tied to a tree near the science building. An Army Explosive Ordnance Disposal team was summoned to disarm the unexploded device.

The university alerted students, faculty and staff to the incident by an e-mail UH Alert message at 5:15 a.m.