According to a release from his office, the ceremony, which took place at the National Palace in Mexico City, coincided with the presentation of similar letters from ambassadors of other 11 countries, including the United States of America, New Zealand, Belgium and Bangladesh.
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Several train carriages plunged to the ground, crushing at least one car, which was on a busy road underneath.
The Mexican-American heavyweight dethroned the British champion in a thrilling upset on June 1 and is now tied in to a contractual second fight.
Rescue workers are searching for survivors buried under rubble and officials warn the death toll may rise