Authorities say a man associated with Harvard Medical School, identified as Feng Tian, assaults and threatens a pregnant woman in two separate incidents, according to police accounts reported by multiple outlets. The woman tells police that Tian beat her and threatened her with a knife. She describes the incidents as occurring on separate occasions, with the most recent allegation taking place in April, when she was nine months pregnant. In that April incident, police say the woman also alleges that Tian forced her to sit in a kitchen while the gas stove was leaking and while the windows were shut, describing conditions intended to keep the situation confined. The reports indicate the allegations are based on the woman’s statements to police and are not described as confirmed outcomes in the coverage provided. Details on charges, dates beyond the April incident, and the results of any investigation are not included in the provided summaries. The case is presented as an ongoing matter involving police investigation into the woman’s claims.