More than 1,000 women from Delta Sigma Theta Sorority will gather on Saturday to celebrate the organization's 99th anniversary despite fears of an unidentified attacker.
Since November 2010, one man has been accused of breaking into the homes of four almunae of the sorority. Police have video surveillance, photographs, the attacker's DNA and an understanding of how he operates but have not been able to identify him.
Police are advising the Deltas to take caution at all of their scheduled events.
Members of the sorority have already reached out to the men of Omega Psi Phi, with whom many share a close relationship, for added safety and security.
NBC 5's Randy McIlwain contributed to this story.