New York may have undercounted COVID-19 deaths among nursing home residents by thousands, the state attorney general charged in a report Thursday that dealt a blow to Gov. Andrew Cuomo's oft-repeated claims that his state is doing better than others in protecting its most vulnerable.

The 76-page report found an undercount of more than 50%, backing up the findings of an Associated Press investigation last year that focused on the fact that New York is one of the only states in the nation that count residents who died on nursing home property and not those who later died in hospitals.

Such an undercount would mean the state's current official tally of 8,711 nursing home deaths to the virus is actually more than 13,000, boosting New York from No. 6 to highest in the nation.