SFPD released this advisory last night:

SFPD has identified the victim of a possible sexual assault which was first reported in a local news journal. The assault, which allegedly occurred in the early morning of hours of Monday, June 18, 2012, near 19th Street and Capp Street, was never reported to the Police Department. An investigation into the incident was initiated after Inspectors from the Special Victims Unit interviewed the author of the “Mission Local” article.

Investigators looking into the June 18th incident have discovered some similarities between the previously unreported incident, and a separate attempted sexual assault case, which was reported to police on June 15th and occurred just five blocks away. On June 15, 2012 on Erie Alley near 13th Street, a woman was approached from behind by two men who grabbed her from behind and attempted to sexually assault her.

In both incidents, the women were assaulted by two men, one short, possibly 5’-04” and the other taller, about 5’-10”. The men were described as being a Hispanic and an African American, or two Hispanic males.

Additional investigative personnel have been assigned to determine if there is any actual connection between these two incidents and Mission Police Station has increased patrols in the area.

The San Francisco Police Department is requesting that anyone having information on either of these incidents contact the SFPD by calling: the Anonymous Tip Line at (415) 575-4444 or Text a Tip via your mobile phone to TIP411 and type SFPD followed by your message. To report a life threatening emergency or crime in progress, call 911.

Early yesterday evening, an officer was also posted at the corner of 19th and Capp handing out the below flyer: