An apartment building is missing a wall in San Juan, Puerto Rico, on Monday, September 25, nearly a week after Hurricane Maria devastated the US commonwealth. Power is still out in most places, and communications remain almost nonexistent on the island of 3.4 million people. Carolyn Cole/LA Times via Getty Images

Yancy Leon rests at the Luis Muñoz Marin International Airport near San Juan on September 25. She's been waiting in line for two days to get a flight out. Joe Raedle/Getty Images

An aerial view shows the flooding in San Juan on September 25. Carolyn Cole/Los Angeles Times/Getty Images

People collect water from a natural spring created by landslides in Corozal, Puerto Rico, on Sunday, September 24. Puerto Rican Gov. Ricardo Rosselló said the island faces a humanitarian crisis. Ricardo Arduengo/AFP/Getty Images

An aerial view shows a flooded neighborhood in Catano, Puerto Rico, on Friday, September 22. RICARDO ARDUENGO/AFP/Getty Images

A man cleans a muddy street in Toa Baja, Puerto Rico, on September 22. HECTOR RETAMAL/AFP/Getty Images

A man walks on a highway divider while carrying his bicycle through San Juan, Puerto Rico, on Thursday, September 21. RICARDO ARDUENGO/AFP/Getty Images

A shack is destroyed in San Juan on September 21. HECTOR RETAMAL/AFP/Getty Images

A gas station's sign is damaged in Punta Cana, Dominican Republic, as the hurricane passed just north of the country on September 21. ERIKA SANTELICES/AFP/Getty Images

Rescue workers drive through a flooded road in Humacao, Puerto Rico, on Wednesday, September 20. Carlos Giusti/AP

A mattress that fell from the third floor is surrounded by debris outside a San Juan apartment complex on September 20. The Washington Post/Getty Images

Damage is seen in Roseau, Dominica, on September 20. STR/AFP/Getty Images

People walk through the destruction in Roseau on September 20. STR/AFP/Getty Images

San Juan is shrouded in darkness after the hurricane knocked out power to the entire island of Puerto Rico. Alex Wroblewski/Getty Images

Power lines are scattered across a road in Humacao, Puerto Rico, on September 20. Carlos Giusti/AP

Residents move aluminum panels from an intersection in Humacao on September 20. Carlos Giusti/AP

Rescue vehicles are trapped under an awning in Humacao on September 20. Carlos Giusti/AP

Trees are toppled outside the Roberto Clemente Coliseum in San Juan on September 20. HECTOR RETAMAL/AFP/Getty Images

Members of a rescue team embrace as they wait to help in Humacao on September 20. Carlos Giusti/AP

A tree is damaged in Fajardo, Puerto Rico, on September 20. RICARDO ARDUENGO/AFP/Getty Images

Debris is strewn across a Fajardo street on September 20. RICARDO ARDUENGO/AFP/Getty Images

A woman closes her property in Naguabo, Puerto Rico, hours before Maria's arrival. Carlos Giusti/AP

People take shelter at Puerto Rico's Humacao Arena on Tuesday, September 19. Carlos Giusti/AP

Two girls play on cots at the Humacao Arena. Carlos Giusti/AP

Waves crash in San Juan as the hurricane neared Puerto Rico on September 19. Jose Rodrigo Madera for CNN

People pray in Humacao on September 19. Jose Rodrigo Madera for CNN

A street is flooded in Pointe-a-Pitre, on the French Caribbean island of Guadeloupe, on September 19. Sipa/AP

People stand near debris at a restaurant in Le Carbet, Martinique, on September 19. LIONEL CHAMOISEAU/AFP/Getty Images

People in Luquillo, Puerto Rico, board up windows of a business on September 19. RICARDO ARDUENGO/AFP/Getty Images

A boat is overturned off the shore of Sainte-Anne, Guadeloupe, on September 19. Dominique Chomereau-Lamotte/AP

Cars line up at a gas station in San Juan on September 19. Jose Rodrigo Madera for CNN

A motorist drives on the flooded waterfront in Fort-de-France, Martinique, on September 19. LIONEL CHAMOISEAU/AFP/Getty Images

Floodwaters surround cars in Pointe-a-Pitre on September 19. Sipa/AP

Soldiers patrol a street in Marigot, St. Martin, as preparations were made for Maria on September 19. HELENE VALENZUELA/AFP/Getty Images

People buy provisions in Petit-Bourg, Guadeloupe, as the hurricane approached on Monday, September 18. CEDRICK ISHAM CALVADOS/AFP/Getty Images