"We're taking the threats seriously," said Colorado Bureau of Investigation spokesman Pete Mang.
FBI began its own investigation into telephoned death threats against Eagle County District Attorney Mark Hurlbert.
Krista Flannigan, Hurlbert's spokeswoman, declined to comment on whether any threats had been made against the 19-year-old woman who alleges Bryant sexually assaulted her.
Nor would she say what precautions if any Hurlbert has taken. Visitors entering the office now must show identification and the door is locked, The Denver Post reported.
Flannigan told the Los Angeles Times on Friday that Hurlbert has been receiving threats since July 18, when the prosecutor charged Bryant with felony sexual assault.
"It has been difficult for people to get their regular work done and accommodate the media, although I think they have a done a remarkable job," Flannigan said in a telephone interview.
The free-agent center signed a two-year, $8.4 million contract late Friday, spurning other teams that could have offered him more money.
"I'm blessed to be in a situation where I don't have to think of money first," Campbell said yesterday at a news conference. "There were other teams that wanted me, but Detroit gives me a chance to play on a contending team that has a chance to jump right into the NBA Finals. I didn't want to be in a situation where it would be two or three years before they were ready to contend."
Campbell is expected to come off the bench as a backup to Ben Wallace and Mehmet Okur. The Pistons also have first-round pick Darko Milicic and Zeljko Rebraca, creating a logjam inside.
Last season, Campbell averaged just 6.1 points and 3.2 rebounds in 56 games with Seattle and New Orleans.
"I think we have a great chance to win a lot of games, and that's the most important thing right now," Piatkowski said. "Money was not a factor. This was a really, really good fit."
The 6-foot-6 free agent forward, who had spent his entire nine-year career with the Los Angeles Clippers, has played in just three playoff games.
Piatkowski averaged 9.7 points last season, shooting just under 40 percent from three-point range. He is the Clippers' career leader in three-pointers.