The Backstory: How the deaths of three sisters affected those making humanitarian water and supply drops in San Diego County

The number of migrants who have died or gone missing trying to cross the U.S.-Mexico border has sharply increased in recent year from an estimated 371 in 2020, to nearly 600 in 2021, to more than that last year. Humanitarian water and supply drops along the border have taken on a new urgency in the wake of the spike. Union-Tribune federal courts and law enforcement reporter Alex Riggins, enterprise editor Kristina Davis, managing editor Lora Cicalo, and publisher and editor …