BOSTON — Federal prosecutors say an Indiana man who was angry about violence at a white nationalist rally in Charlottesville, Virginia, threatened to shoot white people at a conservative free speech rally in Boston days later.

The U.S. attorney's office in Massachusetts says 32-year-old Eric Radulovic was arrested Friday.

Court records say Radulovic posed as a member of the so-called "alt-right" in an online forum and threatened to shoot white attendees at the Aug. 19 Boston rally. They suggest Radulovic was trying to scare people away from the rally.

Prosecutors say he pretended to be sympathetic to the white nationalist movement but was actually angry about it and the death of a woman at the Charlottesville rally.

Radulovic was to appear in an Indiana court Friday. His attorney didn't immediately respond to phone or email messages Friday.