OKLAHOMA CITY ? Terry Nichols has written a letter to a woman who lost two grandchildren in the Oklahoma City bombing and accused a man never charged in the attack of providing some of the explosives used to bring down the building a decade ago.

Nichols, serving a life sentence for his role in the blast, said in the four-page handwritten letter that “I felt the record should be set straight.” He claims Arkansas gun collector Roger Moore gave the explosives to Timothy McVeigh and also provided additional bomb components recently found in Nichols’ former Kansas home.

He sent the letter to Kathy Sanders, who has written a book about her own investigation of the bombing and corresponds with Nichols. A copy of the letter, first disclosed by the Los Angeles Times, was obtained Wednesday by The Associated Press from Sanders’ literary agent, Jim Baird.

An FBI spokesman in Kansas City said the letter would not lead to a new investigation and that there was no indication Moore provided explosives to Nichols and McVeigh. Prosecutors say Nichols stole an estimated $63,000 in weapons and other items from Moore’s home that were then sold to help finance the terror plot.

“We believe the information that came out of the original investigation and we stand by the results of that investigation,” FBI spokesman Jeff Lanza said.

In the early stages of the bombing investigation, the FBI took a hard look at Moore because of his anti-government views and close relationship with McVeigh. But Moore was never charged and has denied any involvement in the bombing. He testified against Nichols about the robbery.

Nichols said in the letter that FBI tests, including fingerprinting, on a “case of little tubes of nitromethane” found about a month ago at his former home in Herington, Kan., would support his claim that they came from Moore and Moore’s girlfriend.

“The Fed Gov’t knows of Roger Moore’s corrupt activities and they are protecting him and covering up his involvement with McVeigh at the OKC bombing!” Nichols wrote.

Oklahoma County Dist. Atty. Wes Lane, whose office prosecuted Nichols in state court last year, said that in attempts to solve the case through plea negotiations before trial, Nichols was asked to discuss the involvement of others in the bombing. He had no relevant information, and never mentioned Moore, Lane said.

Nichols, 50, has been convicted twice, in federal court and an Oklahoma court, and is imprisoned for life without parole. McVeigh was executed in 2001.

The letter was dated April 18, the day before the 10-year anniversary of the bombing that killed 168 people.