safety
5 exposed to 'mace-like substance' at Antioch High School
Summary by The San Francisco Editorial Desk Anne Armstrong , as published by KRON4 (KRON-TV)
· August 21, 2026
· 1 min read
Photo: KRON4 (KRON-TV) · view original
Story provenance No corrections
Summary created by The San Francisco Editorial Desk — automated, rule-governed Byline on source page Anne Armstrong, as published by KRON4 (KRON-TV) Original story Read at the source Source published Aug 21, 2026 Indexed here Aug 22, 2026 AI assistance Automated summary drawn from the source’s own published text Prepublication human review No — editorial rules, flagged-item review, and published samples
Every story comes with a passport. How we work · Corrections log · Publisher’s note
Key points The call for assistance was made around 1:50 p. The Contra Costa Fire Protection District received a call for assistance and sent fire crews to the scene.
Five people were exposed to a substance similar to mace. The Contra Costa Fire Protection District received a call for assistance and sent fire crews to the scene. They treated the affected individuals after arriving.
The incident occurred at a school, where the fire crews found and treated those exposed. The call for assistance was made around 1:50 p.m.
Further details about the incident are available from the Contra Costa Fire Protection District, which responded to the call and treated the exposed individuals at the school.
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Why this story is here
KRON4 (KRON-TV) reported and published this story. The San Francisco selected it, summarised the key facts above, and links to the original. We did not report this story and we added no reporting of our own to it.
About this story
As published by KRON4 (KRON-TV) . The San Francisco selects stories from publishers’ feeds, summarises them, and links back to the publisher that reported them. We add no reporting of our own. We attribute every source, link to the original report, and follow a documented editorial standards policy. To understand how stories are selected and reviewed, read our about page .
For the complete original report, visit KRON4 (KRON-TV) . Have a tip or correction? Contact the editor .
Category: safety Published: August 21, 2026 Source: KRON4 (KRON-TV) Reading time: 1 min
Frequently asked about this story
What is this story about? Five people were exposed to a substance similar to mace. The Contra Costa Fire Protection District received a call for assistance and sent fire crews to the scene. They treated the affected…
When was this published? This article was first published on August 21, 2026 by KRON4 (KRON-TV) and curated for The San Francisco readers.
Who reported this story? This story was reported by Anne Armstrong at KRON4 (KRON-TV). To learn more about how The San Francisco selects and reviews stories, see our editorial standards .
Where can I find related coverage? See more safety coverage from The San Francisco, or browse our daily briefing and topic hubs .
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