✓ Balanced Reporting [9/10]: The headline focuses on factual developments — 'new details' — without resorting to sensational language or emotional triggers.

"Mexico releases new details in Teotihuacán shooting that killed Canadian woman"

✓ Proper Attribution [10/10]: All key claims are attributed to specific officials or agencies, avoiding editorializing or vague assertions.

"Castañeda Camarillo provided a timeline of the shooting, noting the first report came into police at 11:20 a.m. Monday at the archeological site north of Mexico City."

✓ Balanced Reporting [9/10]: The article presents statements from both Mexican and Canadian officials without privileging one narrative, maintaining neutrality.

"Canadian Prime Minister Mark Carney told reporters on Parliament Hill in Ottawa this morning he "very much" appreciates Sheinbaum's "personal attention to the matter.""

✕ Appeal to Emotion [3/10]: Use of emotionally resonant phrases like "Our hearts go out" is directly quoted from officials, preserving objectivity in reporting.

"Our hearts go out to family and friends of the individual who was tragically killed," Carney said. "It's a sad day.""

✓ Comprehensive Sourcing [10/10]: The article draws from multiple high-level, credible sources across two countries, including security officials, heads of state, and international agencies.

"Mexican government officials told reporters at the news conference in Mexico City that the assailant was holding 52 cartridges of a special calibre in a plastic bag while firing, and that in his backpack police found pamphlets related to an April 1999 shooting in the U.S."

✓ Proper Attribution [10/10]: Each piece of information is clearly tied to a named source, enhancing transparency and accountability.

"Investigators attempting to trace the origin of the .38-calibre firearm used at Teotihuacán were informed by the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives that there was no trace of the weapon in its records dating back to 1968."

✓ Comprehensive Sourcing [8/10]: The article includes background on the significance of Teotihuacán as a tourist site, adding relevant context for international readers.

"The Teotihuacán pyramids, a UNESCO World Heritage Site, are a series of massive structures on the outskirts of Mexico City built by three different ancient civilizations."

✕ Omission [6/10]: The article does not clarify how the other injured individuals were hurt beyond falls, despite raising the question — a notable gap in explanatory context.

"It's unclear how the other injured people were hurt, but officials explained that many people had fallen down when the shooting started, some while climbing on the pyramids."

✕ Framing by Emphasis [5/10]: Focus on the Columbine anniversary and pamphlets may overemphasize symbolic connections without establishing causal relevance.

"The shooting in Mexico state on Monday coincided with the anniversary of the Columbine High School massacre in Colorado, in which two students opened fire and killed 13 classmates and one teacher."