Police: FBI says letters are from BTK killer
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 BTK killer's packages have specific numbers. Does the absence of No. 10 mean anything?
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(CNN) -- FBI investigators believe two letters found last year in Wichita, Kansas, are from the so-called BTK killer, police said Thursday.
Authorities blame the self-named BTK (bind, torture, kill) for eight Wichita-area killings between 1974 and 1986.
Based on behavioral analysis, the FBI has determined that a letter dropped in a UPS box in October comes from BTK, said Wichita Police Lt. Ken Landwehr.
The FBI cannot confirm the accuracy of personal information the author included in the letter, said Landwehr, who commands the BTK task force.
A second letter -- found in December in Wichita's Murdock Park -- contained a driver's license for Nancy Fox. Police believe BTK killed Fox in her home on December 8, 1977. Landwehr said the killer took the license from the crime scene.
Other packages
Landwehr also said that the FBI is investigating other recent communications related to the case, including a package found at a television station and a cereal box found by the roadside. Police said both contained jewelry which may have belonged to BTK victims.
On Wednesday, Wichita's KSAS-TV received a package that included notes, a photograph and a piece of jewelry, said Roger Cornish, news anchor for KWCH-TV, which produces the KSAS newscast.
"Police have told us they believe [the package] may be legitimate," Cornish said. "But as with their other communications, they won't know for sure until they send it on to the FBI."
In late January, a cereal box left on the side of a Wichita street bearing initials BTK was found to contain jewelry.
From 1977 until 1979, police and news media received letters written by someone claiming to be the killer.
Twenty-five years later, in March of 2004, a letter believed to be from BTK was found which linked BTK to an eighth killing and included details about the author.
In December, police released details contained in the letters including the writer's claim that he was born in 1939, which would make the killer 64 or 65.
The author of the letter said his father died in World War II, and his grandparents raised him while his mother worked. He said his hobbies include hunting, fishing and camping.
The letter writer said he attended military school around 1960, then served in the military. After he was discharged in 1966, he repaired copy machines and business equipment and had a female Latina acquaintance named Petra, he wrote. He solicited prostitutes and had a lifetime fascination with railroads and trains, the letter writer wrote.
Authorities said they believe the killer frequented the campus of Wichita State University during the 1970s, and used false identification to gain access to people's homes.
