The documents spell out the reasons Muhammad referred to Malvo as his son. That ruse was apparently necessary for Malvo, an illegal alien from Jamaica, to enter Bellingham High school.

That's just one of a series of warning signs and information tidbits that sound ominous now, but were unprovable then.

Some deal with the Bushmaster rifle and Muhammad's interest in guns.

A friend of Muhammad's remembers a trip to a gunsmith. She told police she "heard Muhammad talking about shortening the barrel of a gun, making a collapsible stock, and getting a silencer."

The gunsmith, Glen Chapman, told police Muhammad talked of shortening a gun, but he doesn't remember any talk of a silencer.

Chapman also told police the visit was so strange he thought Muhammad "might have been an undercover ATF agent trying to get him to do illegal modifications."

A man who worked out with Muhammad at the Bellingham YMCA, Harjeet Singh, told police Muhammad showed him "a chrome pipe, 8 inches long, 2 inches in diameter." Singh added: it was "threaded, he (Muhammad) said it was a silencer for a rifle."

The police reports say Singh told them Muhammad "wanted to shoot a police officer and plant a bomb at the funeral to kill more police officers."

Another caller said Muhammad planned to give the rifle to Malvo.

Police say they investigated. But when these reports came in they were disturbing, but there was no proof of a crime.