HOUSTON (CBS Houston) Harris County Sheriff’s Office authorities are searching for a serial rapist who has been targeting victims in north Harris County.

According to officials with the HCSO, there have been seven sexual assaults in the Cypress Station area since 2011, with one or possibly two suspects responsible for the assaults.

Three sketches were released Wednesday by officials, that were created with the help of the victims providing descriptions to the sketch artist.

According to officials, the victims are escorts who are being contacted online. The unsuspecting escort then meets the attacker at an empty apartment or place, and then rapes the escort.

(credit: HCSO)

With the assaults having increased more frequently, the first of the rapes occurred in December 2011, then in May. There was another one that was reported in October and December 2012. In addition to the attacks that took place in 2011, two women were attacked in January of this year; another woman was raped this month.

The public is being asked to be vigilant and to report suspicious activity. Anyone with information that can help authorities in these assaults is being asked to call Crime Stoppers at 713-222-TIPS (8477) or submit a tip online at www.crime-stoppers.org.

Tips can also be sent by text message by texting TIP610 plus your tip to CRIMES (274637). All tipsters can remain anonymous if they desire to do so.