PASCO, Wash. — A protest held here Saturday over the police killing of a Mexican-born apple picker had the air of a mournful family picnic.

About 500 people gathered at a park to protest the death of Antonio Zambrano-Montes, 35, who was killed Tuesday after three officers chased him through a busy intersection with their guns drawn. As he turned to face them, raising his arms, he was felled by their bullets.

According to police reports, Mr. Zambrano-Montes had been throwing rocks at cars and officers.

His death was caught on video by a bystander and the footage has been widely disseminated on social media, fueling anger among the mainly Hispanic population of this quiet agricultural hub in southern Washington State, and drawing comparisons to the shooting of an unarmed black teenager, Michael Brown, in Ferguson, Mo.

“What happened could have happened to any family, to my family,” said Maria de los Angeles Perez, 42, who had come from nearby Kennewick to show her support. She began to cry softly as she signaled to her two sons, Santiago and Samuel.