Colorado Shooting Suspect's Attorney Requests Mental Health Assessment

A suspect appeared in court for the first time regarding a Colorado supermarket shooting. His attorney requested a mental health assessment. The suspect faces ten first-degree murder charges. This incident marks the second deadly mass shooting in the US within a week. Authorities are still investigating and have not identified a motive.

What was significant about Monday's attack in relation to other incidents?

What information have authorities not publicly identified regarding the incident?