Residents' complaints led vice investigators to an alleged house of prostitution in southern Chester County, state police said yesterday.

After a four-month inquiry, police charged four people with prostitution offenses in connection with an alleged brothel that catered to migrant workers in the first block of State Road in London Grove Township, a news release said. Prostitutes were imported from New York and New Jersey through a network, the release said.

Erika Miranda, 22, of Queens, N.Y.; Miguel Aguilar-Flores, 25, of Avondale; Patricia Zambrano-Rojas, 27, of Union City, N.Y.; and Isaias Henandez-Diego, 22, of Avondale, were arraigned before District Judge Rita Arnold and sent to Chester County Prison after failing to post $50,000 cash bail each, the release said. Police said more arrests were expected. - Kathleen Brady Shea