Four men have been indicted by a D.C. Superior Court grand jury on charges that they forced women to engage in prostitution, a development that was described as part of a continuing crackdown by D.C. police and federal prosecutors on prostitution in the city.

The indictments were handed down Thursday. In December, 13 persons were indicted for their alleged involvement in prostitution rings.

Eleven of those have since been arrested, according to Assistant U.S. Attorney Constance Belfiore, who is working full time with six D.C. police detectives on the investigation.

The four men indicted last week were Ronald Givens, 33, of 3006 Oxon Run Ct., Oxon Hill; Ray A. Holman, 28, of 1374 Rittenhouse St. NW; Essex Barlow Jr., 39, of 1709 North Capitol St. and James P. Valentin, 23, of 7888 New Wigs Rd., Adelphi.

Givens, Holman and Barlow were charged with inducing females to engage in prostitution, among other charges. Valentin was charged with making threats to damage property and to injure a person.

Givens and Valentin were arrested over the weekend in Prince George's County, where they are being held for extradition to the District. The other two men are still being sought.