From a Justice Department press release on Wednesday (and see the indictment):
POLAD OMAROV, a/k/a "Araz Aliyev," a/k/a "Polad Qaqa," a/k/a "Haci Qaqa," [has been extradited] from the Czech Republic on murder-for-hire and money laundering charges contained in a Superseding Indictment…. OMAROV was arrested in the Czech Republic on January 4, 2023, at the request of the United States, arrived in the Southern District of New York on February 21, 2024, and will be arraigned on the charges in the Superseding Indictment before U.S. Magistrate Judge Sarah L. Cave later today.
U.S. Attorney Damian Williams said: "Polad Omarov is alleged to have brazenly attempted to murder an outspoken critic of Iran's human rights abuses—right here on American soil. The audacious alleged plot to kidnap and murder the victim are indicative of Iran's policies of aggressive suppression and violence against anyone who speaks against them. Today's extradition makes clear our unwavering resolve to charge and bring to justice any individuals attempting to stifle free speech in the U.S., especially at the behest of a malign foreign regime." …
The press release describes the allegations (while noting they are just allegations):
