Prosecutor: Holmes considered targets

A prosecutor says James Holmes considered other locations and methods for his attack, including biological warfare, before deciding on a mass shooting at a suburban Denver movie theatre.

District Attorney George Brauchler says Holmes ruled out a biological assault because it would require too much knowledge.

He also considered various locations, including airports and other theatres. He concluded an airport would have too much security.

Brauchler says Holmes picked Century 16 in Aurora in part because it had doors he could lock to increase casualties. He also considered factors such as police response times.

Brauchler noted that, before the shooting, Holmes was reluctant to give details about his thoughts to therapists he worked with. However, he freely talked about his desire to kill people with his ex-girlfriend.

The prosecutor said the ex-girlfriend thought Holmes was being hypothetical, and the two severed ties soon afterward.