'Explosions about every 15 seconds'

EUGENE, Ore. -- An explosion on the University of Oregon campus caused an evacuation of the nearby Health Center on the first day of winter term Monday morning, police said.

'There were a few explosions about every 15 seconds," student CJ Willett said. "I got into my dorm and the power was all off. Two minutes later I got a text."

University officials released information in a text message just after 10 a.m. Monday asking students and faculty to avoid the area around the health center at 13th and Agate streets on campus after what they called an "emergency incident" took place.

White and black smoke or steam could be seen rising from an underground tunnel.

"It does seem to be an electrical system-related issue," said Kelly McIver, campus police spokesman, told The Associated Press, "but no speculation as to the cause."

The student health center was evacuated, and power was either out or intermittent to about eight campus buildings, McIver said.

When the blasts started, two electrical workers were nearby in the tunnel system, but it's unknown whether they had anything to do with the explosions, McIver said.

"They exited the tunnel quickly and were not hurt," he said.

Police officials at the scene confirmed that the incident was an underground explosion that shook the area near the building.

University officials said that they do not know what caused the underground explosion.

Intermittent power outages are also being reported around the UO campus

This is a developing story. Watch KVAL News and for updates