Police raided three acupuncture and massage parlors in Greenbelt on Friday that investigators believe were being used as brothels, authorities said.

Police said the parlors in the 7700 block of Belle Pointe Drive, the 7300 block Hanover Parkway and the 7500 block of Greenway Center Drive had been raided last year, but the businesses apparently kept allowing customers to pay for sex acts. They said investigators seized cash and were working to compile criminal charges.