Transcript for Texas Police Hunt for Serial Rapist
Helping -- Texas this morning police hunting for a serial rapists to appears to be targeting alumni of one college sorority. At least four women have been attacked and now the sorority is sending out a mass alert warning women to be on guard. Police say this surveillance video shows the man behind for sexual assaults on women in the Dallas area. The latest Friday night what's worse is it's happening. In the one place that they feel the safest that is in their own home all women assaulted in their homes the attacker breaking in in the middle of the night. After investigators learned all of the victims are African American women in their mid fifties and sixties. They found another startling link. They're all alumni of the delta sigma Theta sorority. An organization of more than 250000. Predominantly black women we -- would -- of their victims were also associated the same way. The attacks spread across three towns over the last eleven months all between 9 PM and 4 AM. Perhaps most alarming during each assault police say the suspect revealed that He -- personal details about his victim. In an email to local chapter alumni. Delta sigma -- -- leadership admitted quote this is frightening to all I'm somewhat unbelievable that our sister hood -- being attacked in this manner. And -- on to say that they are aggressively gathering information to distribute to the chapters. Now police say it remains unclear how or why the attacker is choosing his victims.
This transcript has been automatically generated and may not be 100% accurate.