Protests began last week in opposition to a now-cancelled tax reform plan but demonstrators have expanded their demands to include government action to tackle poverty, police violence and inequality in the health and education systems.
By joining calls to share technology behind Covid-19 jabs, the Biden administration will add heft to a growing group of leaders who believe there is an urgent, if temporary, need for wider access to treatments if the world wants to end the pandemic.
At least 24 people died and dozens others were injured on Monday night in the accident, one of the worst ever to strike the Mexico City metro, raising questions about construction and maintenance standards on a network used by millions every day.
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