their bedrooms the same night, same general area, same suspect description. we never used to dead bolt our doors or lock our bedroom doors, but now we do. you never think it will happen to you. but in the back of your mind, you re not sure. reporter: now many young women are doing what police have been asking, be on guard. reporter: police say in each of the cases, there was no sign of forced entry into the victim s home. that s why police here are asking students to keep their doors and windows locked at night. derek valcourt, wjz eyewitness news. and camp us police are skull also encouraging women to call police immediately if they notice anything suspicious near their apartments or homes. investigators are reenacting the disappearance of a maryland woman, robyn gardner, who appears to disappear without a trace. wjz is following the investigation. prosecutors waited to singe the reenact. 35-year-old robyn gardner disappeared. the man she was traveling with, ga