A Kentucky man accused of trying to mail a bomb to the president has pleaded not guilty to charges that he threatened the president, illegally possessed weapons and firearms and made false statements.

A grand jury handed up the indictment against David Shane Shelby, 30, on Thursday. He entered his plea Friday morning.He was indicted on one count of threatening to assault a U.S. official, one count of threatening the president, a firearms count, an explosives count and three false statement counts for allegedly lying about his criminal past in order to buy weapons from area stores the day before he was arrested.

He is being held without bail in the Salt Lake County Jail.

Shelby illegally possessed two pistols, two revolvers and three rifles at the time of his arrest, according to the indictment.

The day before he was arrested, he bought a rifle from a K mart store in Salt Lake County, a rifle from a K mart store in Weber County and another rifle from a Wal-Mart store in Weber County, the charges say.

Secret Service agents began looking for Shelby after he allegedly mailed letters to Clinton and Vice President Al Gore from Indiana on Dec. 7 that threatened each with death. Clinton was ordered to release mass murderer Charles Manson or be killed. Gore was instructed to step down as vice president and appoint Manson henchman Charles "Tex" Watson as his replacement or die.

Shelby was arrested Jan. 26 as he tried to mail two packages at an Ogden mail store. One package, addressed to Clinton, contained a homemade bomb. The other package, addressed to Manson, contained a gun.

A search of Shelby's rented truck revealed three pipe bombs stuffed with powder and bullets, four explosive items consisting of shotgun shells attached to an explosive device similar to the pipe bombs.

The agents also found light bulb crammed with powder in the package addressed to Clinton.