A woman prays in front of hundreds of shoes that were displayed in memory of those killed by Hurricane Maria in front of the Puerto Rican Capitol, in San Juan. Hurricane Maria, which pummeled Puerto Rico in September 2017, is likely responsible for the deaths of more than 4,600 people, some 70 times more than official estimates, US researchers said Tuesday. Ricardo Arduengo / AFP
A child illuminates hundreds of shoes at a memorial for those killed by Hurricane Maria, in front of the Puerto Rico Capitol, in San Juan. Puerto Rico's Institute of Statistics announced that it has sued the US territory's health department and demographic registry seeking to obtain data on the number of deaths following Hurricane Maria as a growing number of critics accuse the government of lacking transparency. Ramon Espinosa / AP Photo
A sign reads "4645" near empty shoes outside the Capitol building in this aerial photograph taken during a protest against the government's reporting of the death toll from Hurricane Maria in San Juan, Puerto Rico. Xavier Garcia / Bloomberg
A woman holds a placard that reads in English "genocide" in front of hundreds of shoes that were displayed in memory of those killed by Hurricane Maria in front of the Puerto Rican Capitol, in San Juan. Ricardo Arduengo / AFP
View of a Puerto Rican flag placed on a pair of shoes among hundreds displayed in memory of those killed by Hurricane Maria in front of the Puerto Rican Capitol, in San Juan. Ricardo Arduengo / AFP
Shoes are displayed at the Capitol to pay tribute to Hurricane Maria's victims in San Juan, Puerto Rico. Alvin Baez / Reuters
Candles sit inside pairs of shoes displayed outside the Capitol building during a protest against the government's reporting of the death toll from Hurricane Maria in San Juan, Puerto Rico. Xavier Garcia / Bloomberg
A woman walks among hundreds of pairs of shoes displayed at the Capitol to pay tribute to Hurricane Maria's victims in San Juan, Puerto Rico. Alvin Baez / Reuters
Hurricane Maria victims remembered in Puerto Rico - in pictures
Hundreds of shoes displayed in front of the Puerto Rican Capitol in San Juan in memory of those killed in September 2017