The U.S. is rallying relief efforts as Puerto Rico deals with a series of problems following Hurricane Maria.

The U.S. Department of Energy says its deployed agents to assess damage and begin grid restoration efforts.

Millions of residents still do not have electricity.

Downed power lines are making cell phone signals hard to come by.

The storm destroyed 85 percent of all the island's towers.

Satellite phones are helping some get in touch and generators are helping people power up to send messages.

Residents are also experiencing major shortages for supplies including fresh water and gas.

House Speaker Paul Ryan says lawmakers will make sure Puerto Rican residents "have what they need."

Governor Andrew Cuomo says the federal government needs to step up its efforts and do it fast.

"This is not weeks or months. If we don't get on this and start doing it quickly, this could be years before the island fully recovers,' Cuomo said.

Hurricane Maria is being blamed for killing at least 10 people in Puerto Rico.

The death toll is expected to climb once crews reach remote areas.

Forecasters say the storm could brush the Carolina coastline later this week.