By Robin Culverwell

DOYLESTOWN, Pa. (CBS) — An autopsy conducted on the body of a Bucks County college student found dead in her dorm room Monday afternoon has proven inconclusive so far.

Gabrielle Hillman, 21, was found dead by her roommate on Monday at Delaware Valley College, in Doylestown (see previous story).

Today, county coroner Dr. Joseph Campbell says there was no sign of trauma or injury, but the initial autopsy failed to pinpoint a cause of death.

Campbell says he’ll now wait for toxicology and histology reports, looking for possible toxins in the body and taking a closer look at tissue samples.

Those tests will take another three to four weeks.