Hadi Matar, the man accused of nearly fatally stabbing British-American writer Salman Rushdie, is negotiating a plea agreement with both US state and federal prosecutors that could shed light on whether a foreign government or terrorist organization was involved in the attack, officials involved in the case told Semafor.

Matar is scheduled to go on trial for attempted murder this September in a western New York courthouse not far from the Chautauqua Institution where Rushdie was assaulted while giving a speech in August 2022 at a summer cultural festival. But federal prosecutors from the US Attorney’s Office are separately investigating whether Matar, 26, was part of a broader conspiracy to assassinate the writer, according to lawyers and US officials involved in the case. The revolutionary founder of the Islamic Republic of Iran, Ayatollah Ruhollah Khomenei, issued a fatwa, or religious decree, in 1989, calling for Rushdie’s death on the grounds that his novel, The Satanic Verses, was blasphemous against Islam.