A sixth-grade teacher was convicted Monday of making false bomb threats that targeted five students attending the middle school where she taught. Michelle J. Dohm, 41, had pleaded not guilty but agreed to a written statement of facts, on which Frederick County Circuit Judge Julie Stevenson Solt based her verdict. In return, prosecutors dropped seven felony threat counts and four misdemeanor stalking counts. Dohm, a married mother, made the threats from September 2005 to April 2006. The threats were in notes found in the boys' lockers, a Thurmont Middle School bathroom and envelopes mailed to two of the victims' homes. Some of the notes began, "Tick Tock Tick Tock. Is it a bomb or is it a clock?" Solt ordered a pre-sentencing investigation that will include a psychiatric examination. Sentencing is set for June.