A powerful magnitude 7.3 earthquake struck off the coast of Mexico’s southernmost state of Chiapas on Friday, shaking buildings as far away as Guatemala and El Salvador, though authorities said there were no immediate reports of casualties or major damage.Mexican President Claudia Sheinbaum said emergency protocols were activated but that neither Chiapas nor the neighbouring state of Tabasco reported issues, and Guatemalan President Bernardo Arevalo said there were no deaths.In some parts of...