PLEASANT HILL -- Three women were arrested on suspicion of prostitution after a series of undercover operations, Pleasant Hill police said Thursday.

San Gabriel resident Ying Wang, 31, and Pleasant Hill resident Youyan Feng were arrested just blocks apart on Oct. 3 by Pleasant Hill police officers and Contra Costa County sheriff's deputies, said Pleasant Hill police Lt. Dan Connelly.

Wang was arrested at the Happy 8 Massage Parlor, located at 52 Golf Club Road, and Feng was arrested at Healing Garden Spa, located at 200 Gregory Lane.

On Wednesday, an unidentified Asian woman was arrested at Kai's New Life Spa, located at 2624 Pleasant Hill Road.

Wang and Feng were cited for prostitution, and the woman who has yet to be identified was booked into County Jail in Martinez, according to Connelly. Police have not said what charges the woman faces.

Contact Katie Nelson at knelson@bayareanewsgroup.com and follow her at Twitter.com/katienelson210.