One of the men convicted last year of being part of a local group conspiring to plot terror overseas faces new charges.
A federal grand jury handed up an indictment on Tuesday against Hysen Sherifi, accusing him of having a part in a plan to hire a hit man to behead three witnesses who testified against him.
Sherifi is accused of plotting with his younger brother Shkumbin Sherifi, 21, and Nevine Aly Elsheikh, a 46-year-old special education teacher, to pay a hit man to kill the three people whose names have not been revealed publicly in court documents.
Elsheikh and Shkumbin Sherifi were arrested last month and are being held in jail.
Elsheikh, on leave from Sterling Montessori Academy and Charter School in Morrisville since her arrest, has appealed a judge's order that she remain jailed until her trial. Her attorneys said at a detention hearing last month that she was nothing more than a courier who passed information from Hysen Sherifi, while he was in jail, to a man on the outside, not knowing about the alleged plot.
Hysen Sherifi, 27, was sentenced in January to 45 years in prison for conspiring to provide material support to terrorism and conspiring to carry out attacks overseas, two counts of firearms possession and conspiring to kill federal officers or employees.
A warrant was issued for his arrest on Tuesday related to the new charges.