Police in Mexico City surrounded a community center attached to a church on Avenida 606 in the San Juan de Aragón neighborhood on Tuesday after an armed man seized at least one instructor and reportedly held a second person hostage. According to initial information, the gunman was a former gym employee who confronted an ex-colleague over his dismissal three years ago. The city’s Secretaría de Seguridad Ciudadana deployed patrol officers, negotiators and the Unidad Metropolitana de Operaciones Especiales. The area was cordoned off and a nearby public school was evacuated as a precaution. Authorities said no shots had been fired and no injuries were reported while negotiations continued to secure the hostages’ release.