The powerful earthquake that struck Mexico on Tuesday has killed more than 200 people, and more deaths are expected. Buildings collapsed across Mexico City, including a school where at least 30 students were believed to have been killed. Rescuers on Wednesday scrambled to dig out people trapped beneath rubble.

Less than two weeks ago, the strongest earthquake to hit Mexico in a century killed at least 90 people and destroyed thousands of homes.

“One difficulty that we see in vetting international organizations is that there is no large standardized body that takes in validated information about these organizations,” Ms. Nason said.

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