FAYETTEVILLE (AP) — An Arkansas man charged with sending threatening letters and white powder in the mail is to be held in custody until his trial.

A federal judge on Thursday ordered Philip Hanson to be detained pending his trial, which is scheduled for July 9.

Authorities say Hanson mailed threatening letters and white powder to some of his former co-workers after he was laid off from a Christian greeting card company.

Employees at Siloam Springs-based DaySpring Cards received threatening letters laden with biblical-sounding references and sometimes a nontoxic white powder.

The scare last year came about a decade after a number of envelopes containing a white powder that turned out to be anthrax were mailed to news organizations and other locations.

Hanson’s attorney, Ken Osborne, maintains that Hanson is innocent.