OAK CREEK, Wisconsin (CNN) -- The suspect in the Wisconsin Sikh temple tragedy is dead and can never be questioned about his motives, but authorities have arrested Wade Michael Page's former girlfriend on a weapons charge.
Teresa Carlson, the special agent in charge for the FBI in Milwaukee, said that no clear motive has been established and that Misty Cook, Page's former girlfriend who was arrested Sunday, is probably not linked to the shooting.
"We do not believe she had anything to do with it," Carlson said.
After authorities went to Cook's home to interview her, she was charged with possessing a gun, which is illegal because she is a felon.
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Page, a 40-year-old Army veteran who neighbors say played in a so-called hate-rock band, was the lone gunman, Carlson said.
Police have not found any notes or other clues as to why Page went on a killing spree at the Oak Creek temple, and his family members have not reported observing warning signs.
"This is a guy who moved around a lot," Carlson said. "We are zeroing in one any possible motives, but right now, we don't have one."
She said authorities have conducted more than 100 interviews nationwide, with people including Page's family members, associates and neighbors. Authorities are also reviewing his e-mails and other electronic records.
The investigation continued as a community reeled from the carnage.
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