Marcelo Ebrard

Fifteen people were killed and about 70 injured when a railway overpass collapsed onto a busy road in Mexico City on Monday night.

Rescue efforts for potential survivors were paused shortly after the accident, authorities said, because of the risk that more of the metro overpass and train cars could slam down onto the road.

The United Nations on Feb. 17 led calls for a coordinated global effort to vaccinate against COVID-19, warning that gaping inequities in initial efforts put the whole planet at risk.