WATCH: Puerto Rico governor warns of humanitarian crisis after Maria
Puerto Rico is virtually without power or cell service after Hurricane Maria barreled through the island, leaving those searching for loved ones in a shroud of uncertainty.
Puerto Rico Gov. Ricardo Rosselló said the island is facing an "unprecedented disaster" after the storm made landfall as a powerful Category 4 hurricane last week.
While about 5 percent of electricity had been restored across the island by Monday night, generators remain the only source of power for more than 3 million American citizens.
The storm killed at least 16 and left the island littered with rubble from demolished homes and downed trees and power lines.
How to help relief efforts
Donate supplies: Puerto Rico's government created a presentation on the emergency and construction supplies needed to help those in need. It is also urging people to use social media to encourage people to donate to the relief fund. Puerto Rico's first lady, Beatriz Rosselló, has also set up a relief fund called United for Puerto Rico, which connects those in need to the private sector.
Volunteer: Volunteer or contribute to the American Red Cross, Catholic Charities, or the Salvation Army, which are accepting relief funds for areas affected by hurricanes Harvey, Irma and Maria.Alex Wroblewski/Getty Images
A resident surveys the damage on her property after Hurricane Maria made landfall, Sept. 21, 2017, in the Guaynabo suburb of San Juan, Puerto Rico. The majority of the island has lost power, in San Juan many are left without running water or cell phone service, and the Governor said Maria is the "most devastating storm to hit the island this century."
How to help in your area:
New York: The Hispanic Federation teamed up with prominent New Yorkers to launch "Unidos": A Hurricane Relief Fund for Hurricane Maria Victims in Puerto Rico, which will be managed by the nonprofit. The relief fund will also support people in the Dominican Republic who were impacted.
Miami: The Puerto Rican Leadership Council is accepting donations of clothing, water and nonperishable food at several locations, according to the Miami Herald.What you need to know about the federal response to the crisis in Puerto Rico
Trump to visit hurricane-ravaged Puerto Rico, says he is 'very proud' of 'amazing' response
San Juan mayor says people are 'gasping for air' as Maria cripples Puerto Rico
How to try to reach loved ones in Puerto Rico
Email Puerto Rico's disaster relief team at maria1@prfaa.pr.gov. Because of high volume, officials are asking that people only send one email and no follow-ups. Include as much information about the people you are concerned about and your contact information.
Call the Puerto Rico Federal Affairs Administration's Washington, D.C., office at 202-800-3133 or 202-800-3134. Staffers are taking names and numbers to develop plans on conducting welfare checks.
Call local Puerto Rico radio station WIPR at 787-777-0940.
Use the Red Cross' Safe and Well database, where survivors can mark themselves as safe and family members can search through the list of registrants.Carolyn Cole/Los Angeles Times/Polaris
Hurricane Maria knocked out the entire grid across the Puerto Rico.