A group building an Islamic center in Roxbury has subpoenaed a freelance writer and a Christian broadcasting company who have reported on the project, documents show.

The Islamic Society of Boston issued subpoenas to Tamar Morad, a Waltham-based writer for The New Republic, and the Cambridge-based Christian Broadcasting Corp. as a part of its defamation case against the Boston Herald, WFXT-TV (Fox 25) and other, non-media groups.

The subpoena asks Morad, who declined to comment, to turn over any communications between her and the lawsuit’s defendants concerning the ISB and Osama Kandil and Yousef Abou-Allaban. The Christian Broadcasting Corp. is being asked to submit any of its broadcasts on the ISB, Kandil and Abou-Allaban, documents show.

ISB attorney Howard Cooper could not be reached yesterday.