UPDATE:  18-year-old Brooke Koppari of Colorado Springs was found not guilty.

One woman from Casper and three others from Colorado face charges for prostitution, following an undercover operation.

Investigators say undercover agents made contact with the women through the “escort” section of a popular website.

After meeting at an undisclosed location, prosecutors say the undercover operatives eventually reached an agreement involving various sex acts in exchange for money.

The undercover agents then signaled nearby law enforcement officials who made the arrests.

Court documents indicate 42-year-old Angela Smith of Casper, along with 21-year-old Sierra Hutcheson and 27-year-old Lindsey Gifford of Aurora, Colorado, along with 18-year-old Brooke Koppari of Colorado Springs are jailed on misdemeanor charges of engaging in prostitution.

Each faces up to six months in prison if convicted.