Notes found on Michigan State gunman "gave an indication" of possible motive, police say

The gunman who killed three students and critically injured five more in a mass shooting at Michigan State University had two pages of notes in his wallet that police said could provide insight into why he did it. 

The notes, which officers found on the shooter after he died of a self-inflicted gunshot wound in the hours following the massacre, threatened several institutions, including a church, a New Jersey school district and various businesses to which he had personal ties, authorities confirmed at a news conference on Thursday morning.

Anthony Dwayne McRae, 43, was previously identified as the suspect in Monday night's attack at the university. Michigan State Police Lt. Rene Gonzalez said Thursday that authorities believe McRae acted alone and is the only suspect in the shooting. Although an investigation by local, state and federal law enforcement agencies aims to piece together the gunman's motive, they have not yet determined it, Gonzalez said.