# Security and theft issues at AHMSA steel plant

> Live situation record from CLSTR: https://clstr.news/situations/security-and-theft-issues-at-ahmsa-steel-plant
> Updated: 2026-09-30T21:51:22.000Z. Sources: 5. Developments: 2.

Tensions and security concerns have emerged at the Altos Hornos de México (AHMSA) steel plant in Monclova, Coahuila. Initially, former workers maintaining a blockade at the facility raised alarms regarding the entry of a Sistema Intermunicipal de Aguas y Saneamiento (SIMAS) vehicle through Gate 4, fearing it might be used to remove company equipment.

SIMAS officials clarified that the entry was for essential maintenance on drainage lines that pass through the plant. However, subsequent reports indicate that the State Attorney General's Office is investigating multiple thefts within the facility. These investigations include the disappearance of seven to nine electrical breakers, with former employees estimating the value of stolen equipment could exceed one million pesos. In response to these incidents, AHMSA has reportedly dismissed certain security personnel and increased surveillance at critical points.

## Timeline

### 2026-09-30: AHMSA steel plant thefts under investigation in Coahuila

Authorities in Coahuila are investigating multiple thefts at the AHMSA steel plant in Monclova, including the disappearance of several industrial electrical breakers.

4 sources. https://clstr.news/cluster/ahmsa-steel-plant-thefts-under-investigation-in-coahuila

### 2026-09-11: SIMAS clarifies entry into AHMSA plant following worker concerns

Former AHMSA workers expressed concern over a SIMAS vehicle entering the steel plant, fearing equipment theft, while SIMAS clarified the entry was for urgent drainage maintenance in Monclova.

2 sources. https://clstr.news/cluster/simas-clarifies-entry-into-ahmsa-plant-following-worker-concerns

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Cite as: Security and theft issues at AHMSA steel plant. CLSTR, https://clstr.news/situations/security-and-theft-issues-at-ahmsa-steel-plant