Police are urging women to be on alert after a series of attacks in Montgomery County.
On three separate occasions at two places, a man has suddenly surprised and grabbed a woman from behind.
All three assaults occurred around 10:30 to 11 p.m. in neighborhoods thought to be safe.
And in each case, the woman was attacked while walking alone.
ABC7's Richard Reeve has more on the story, including a description of the suspect.