Three people inside a house await rescue from the floods caused by Hurricane Fiona in Cayey, Puerto Rico.
CNN  — 

Fiona is the first major hurricane in the Atlantic this season, strengthening to a Category 4 storm after battering Puerto Rico, the Dominican Republic and the Turks and Caicos.

Millions were left without power or running water, and disaster-stricken communities are struggling to recover from the aftermath of major flooding, destroyed buildings and damaged infrastructure.

Several organizations already have teams on the ground providing assistance. You can help them here or by clicking the button below.