A visiting-hour fight at El Castillo prison in Mazatlan kills nine inmates and a minor

Ten people were killed on Thursday morning inside El Castillo penitentiary in Mazatlan, during family visiting hours. Sinaloa's Public Security Secretariat said nine inmates and one family member died. Sixteen prisoners were taken for medical treatment. The prison holds about 1,800 people. By Thursday night the federal security cabinet said it was under control.

Sinuhe Tellez, the state's secretary of public security, said in a video posted on social media that the visitor who was killed was a minor. The secretariat did not publish the child's age. Social work staff were contacting the families of the dead. Visits were suspended as a precaution. Tellez said the rest of the prison population was safe.

The violence started on Thursday morning at the port-city prison. Local media reported that inmates used firearms. The state authorities have not said how the deaths occurred, and they have not said whether guns were brought in by visitors or were already inside. After the clash, the army, the National Guard, the navy and state security forces entered the building. An inter-institutional group stayed on the site once order was reported restored.

The timing is the detail that changes the incident from a closed-yard fight into a visiting-day failure. Family hours are the point in the week when people who are not inmates are inside the walls. A death among those visitors, and the identification of that visitor as a minor, is why the secretariat suspended further visits rather than only locking down a cell block.

Sinaloa is in the middle of a fight between factions of the Sinaloa cartel, the organisation that took its name from the state. The U.S. State Department lists Sinaloa among six Mexican states it tells Americans not to visit on security grounds. Officials have not said the prison deaths were part of that conflict. The absence of a stated link is itself part of the public record on Friday. The forces sent in were the same mix, army, Guard, navy and state police, used on the roads outside the prison.

Mazatlan is a Pacific port and a tourist city. El Castillo is the state prison that serves it. A facility of 1,800 inmates is large for a city prison. Control, in the cabinet's wording, means the perimeter and the yards were back in the hands of the security group. It does not mean the secretariat has published a count of weapons recovered, a list of the dead, or a finding on how a minor came to be killed in a visiting room.

Mexican prisons have a long record of fights that start during visits, when relatives, food and, in some cases, weapons cross the gate. Thursday's statement did not put El Castillo in that pattern by name. It did put the deaths inside visiting hours, and it did put a family member among the dead. Those two facts are enough to explain the visit ban.

The 16 injured were prisoners, not visitors, according to the secretariat. They were moved for treatment. No hospital list was released. No figure was given for injured staff. The public toll on Friday morning remained 10 dead and 16 injured, with the dead split 9 and 1.

Tellez's video is the only official place the minor is identified as such. Wire services, including the Associated Press and Al Jazeera, carried that identification from the video and from the secretariat's account on X. Neither has published a name. The secretariat said families were being contacted. That sequence, video first and names later, is where the case stood on Friday.

The federal cabinet's line that the prison is under control closes the tactical phase. It does not close the question of how a visiting day produced a firearm fight, if the local reports of guns hold, or how a child was in the part of the prison where the killing happened. Those questions sit with the state prosecutor and with the security secretariat that suspended the visits.

Sinaloa's other emergency on Friday was weather, not the prison. Hurricane Simon was offshore, with a warning up the coast to the south. Mazatlan itself was outside the hurricane warning that ran from Punta San Telmo to Punta Mita. The prison toll and the storm are separate files. Both were open on the same morning in the same state.