Washington, Utah, located just southeast of Zion National Park, is surrounded by cinematic mesas and has long been a hub for exploring the natural wonders of the American west.

Yet the last 48 hours have left residents wondering how the portal to the most beautiful parts of the country may have produced one of its ugliest acts of political violence in years.

Public records and police statements indicate that Tyler Robinson, the man authorities accused of killing the conservative activist Charlie Kirk at Utah Valley University this week, resided in the area. On Saturday, authorities released an affidavit charging him with aggravated murder, felony discharge of a firearm, and obstruction of justice.

Local and federal law enforcement descended on typically quiet blocks in Washington and nearby St George, banging on doors and closing off streets as they carried out a high stakes investigation.

Outside the home tied to Mr Robinson and his parents in Washington, neighbours expressed shock that a fellow resident could have committed such an attack.