Security forces have also surrounded Nariman House, a five-story residential building near the Trident Oberoi hotel that contains an office of the Jewish outreach group, Chabad Lubavitch. Rabbi Gavriel Noach Holtzberg, the group's main representative, is thought to have been taken hostage. Reports say his wife and daughter have been freed. The Reuters news agency says that four gunmen remain in the building. There have been reports of gunfire.