Authorities said the bodies of two previously missing Montgomery County teenagers will undergo autopsies today, but investigators won’t know the exact cause of death for several weeks.

Police said the deaths of Rachel Smith, 16, of Potomac, and Rachel Crites, 18, of Gaithersburg, appeared as a double-suicide, but authorities won’t know how they died until a Fairfax County medical examiner completes the toxicology tests in three to six weeks, Loudoun County Sheriff’s spokesman Kraig Troxell said