### Summary of Articles

Common Themes: 1. All articles reported on a shooting incident that occurred in a Midtown Manhattan office building, resulting in the death of five people, including a New York City police officer and the shooter taking his own life. 2. The gunman was identified as Shane Devon Tamura, a 27-year-old from Las Vegas. 3. The shooting took place at 345 Park Avenue, which houses the headquarters of Blackstone and the NFL. 4. The suspect was armed with a rifle and began shooting in the lobby before moving to the 33rd floor. 5. The gunman's motives are under investigation, with emphasis on a note he left behind mentioning CTE. 6. Law enforcement responded quickly, and significant emphasis was placed on their efforts. 7. Officer Didarul Islam, an immigrant from Bangladesh, was specifically mentioned for his sacrifice and heroism.

Differences: 1. Motive & Details:
More liberal sources like ABC News highlighted suspicions of CTE (Chronic Traumatic Encephalopathy) and mental health issues, with an emphasis on the link between the suspect's past and football, as well as a note mentioning the NFL.
Conservative outlets like Newsman and Breitbart mentioned the note but were less detailed about CTE and focused more generally on the gunman's mental health history without linking it explicitly to CTE. 2. Victim Identification:
NBC mentioned the identity of one civilian victim, a Blackstone executive, while the conservative sources provided few details about individual civilian victims. 3. Tone and Emphasis:
Liberal sources focused more on the societal implications of gun violence, mental health, and the responsibility of organizations like the NFL, emphasizing systemic issues.
Conservative sources focused on the police response and immediate details of the event without diving deeply into potential systemic issues.

Likely Reality Between Biases:
The suspected gunman, Shane Devon Tamura, had a troubled mental health history with incidents in Nevada and left notes indicating distress possibly linked to CTE, though without professional confirmation.
The incident underscores both a systemic gun violence problem and potential mental health implications, especially concerning athletes—a topic that may require further exploration through medical evaluation posthumously.
The New York authorities, as reported across media perspectives, handled the situation swiftly, demonstrating strong law enforcement presence and reaction to active shooter scenarios. Ultimately, while the underlying complexity of motives such as mental health and gun access are highlighted differently across media lines, the factual core remains consistent. The tragedy is a vivid reminder of the multifaceted challenges related to gun violence, mental health, and policy implications.