BOISE - Four women have been charged with prostitution at several Treasure Valley massage parlors.

Boise Police say the four women were arrested at various different Boise massage parlors on Wednesday.

Charges against the suspects include prostitution, giving a massage without a city license, and violating city sanitary requirements by living or allowing employees to live and sleep inside the massage parlor.

"We have gotten a couple of complaints, anonymous complaints, from people who have been inside and they say suspected inside prostitution was happening," said Sgt. Mike Harrington with the Boise Police.

Boise Police began getting citizen complaints several weeks ago alleging criminal activity including prostitution occurring inside several local massage parlors. Those tips led to a undercover investigation where Harrington says four undercover officers: "Go in there pay for a massage and then they eventually wait to get solicited for additional money for additional acts and those acts would include acts of prostitution."

The arrests took place at the Hong Kong Spa on Broadway Avenue, the Apple Spa on North Orchard and the J Spa on Orchard. Police arrested Sun Shim-Chang, 59, Kyong Cha Roberts, 57, Kyo Chin Oh, 50, and Fenghua Sanfor, 48,. The women were arrested for prostitution,massage license-related issues.

"I have always been somewhat suspicious of businesses like this," said one man, who did not want to be identified, but works next to one of the parlors.

Police say if the women are convicted they face up to six months in jail and $1000 in fines.