The first fire reported on Maui may have been caused by damaged power lines, according to Bob Marshall, CEO of the power monitoring company Whisker Labs.

On Aug. 7 at 10:47 p.m., a security camera at the Maui Bird Conservation Center captured a bright flash in the woods that, according to Jennifer Pribble, a senior research coordinator at the conservation center, may have been a tree falling on a power line. After that, the power went out, she said.

The fire was reported shortly after midnight, according to Maui County officials.

According to Marshall, that bright flash seen on video was likely an explosion from a power line fault, meaning the power line came into contact with something like a tree or vegetation.

Marshall told ABC News that its sensors at Maui homes recorded a "very sharp drop in electrical voltage" at precisely the same time the flash was seen on the security video.

"The grid was incredibly stressed Monday night and throughout the day on Tuesday," Marshall said. “It was trying to deal with the winds that it was encountering. and what our network clearly documents is that there were 122 faults that occurred throughout that time period, any one of which could have ignited a fire."

-ABC News' Emmanuelle Saliba

Maui is facing a "very long and hard recovery," FEMA Administrator Deanne Criswell said at Wednesday's White House briefing.

Criswell called the response a "very active and dynamic situation" with FEMA search and rescue teams continuing to work closely with state officials to look for those who are missing.

She said 30 specialists from the Department of Health and Human Services' mortuary teams are in Maui and will soon be joined by a team from the Department of Defense to help identify loved ones.

At least 40 canine search teams are also on the island, "in addition to hundreds of search and rescue personnel, with more on the way," she said. "We're working carefully to search the affected areas thoroughly and compassionately while respecting all of the cultural sensitivities."

Criswell spoke to how difficult and lengthy this search operation will be for the canines to endure the heat and maneuver through the fire debris.

"They have to deal with issues with their paws, walking through glass and debris. And in these conditions, the dogs require frequent rest, which is why we are sending in additional dogs to augment the operation," she said.

FEMA has given $2.3 million in assistance to families. She said there's resources to pay for home repairs, cars and appliances, but only 1,300 households are registered with FEMA so far.

She urged residents to "register for assistance with FEMA, with either our staff on the ground through our website at , or by calling 1-800- 621-3362."

Before the briefing, Criswell updated President Joe Biden on the recovery efforts. Criswell said Biden spoke with Hawaii's governor again on Wednesday and approved the state's request for 100% reimbursement for the emergency work that's being done "for a period of 30 days within the first 120 days at the governor's choosing."

Criswell said that when Biden visits Maui on Monday, "he's going to be able to bring hope."

"He's going to speak with the governor and the state’s first lady, and talk to survivors and hear their stories," Criswell said. "And it’s that level of hope that I think is going to really be a positive impact for this community."

-ABC News' Justin Gomez

Katie Shannon of the Maui Humane Society estimates that 3,000 pets are missing from wildfire-ravaged Lahaina.

So far, the Maui Humane Society has received 52 injured animals, including some suffering from smoke inhalation and some with burns, Shannon told ABC News.

"We have also seen severe burns -- cats that look, I don't think that their owner may even know that it is their cat because they look so burnt. Their ears are burnt, their faces are burnt. It's just incredibly severe," Shannon said.

The Maui Humane Society is not only sending food and supplies to the hardest-hit areas, but is also trying to reunite owners with their pets. A dog named Roman was separated from his pet sitter during the fire when the sitter jumped into the ocean and Roman refused to follow. Roman, who was missing for a couple days, was found by a good Samaritan, taken to the humane society and, thanks to his microchip, was reunited with his owners.

"That is our goal -- to reunite every pet and owner, and also to provide the lifesaving care that these pets need," Shannon said.

The Maui Humane Society is sending many of the animals it had on site before the fires to the mainland to make room for the animals coming in from the Lahaina area.

-ABC News' Will Carr and Timmy Truong

President Joe Biden and first lady Jill Biden will travel to Maui on Monday "to meet with first responders, survivors, as well as federal, state, and local officials, in the wake of deadly wildfires on the island," according to the White House.

"In Maui, the President and First Lady will be welcomed by state and local leaders to see firsthand the impacts of the wildfires and the devastating loss of life and land that has occurred on the island, as well as discuss the next steps in the recovery effort," White House press secretary Karine Jean-Pierre said in a statement on Wednesday. "The President continues to marshal a whole-of-government response to the deadly Maui fires, and he has committed to delivering everything that the people of Hawaii need from the federal government as they recover from this disaster."

-ABC News' Justin Gomez

Maui Chamber of Commerce President Pamela Tumpap detailed the level of devastation in a phone interview with ABC News Live.

"Our beautiful island has been ravaged by fires from the mountain to the ocean," Tumpap said.

Tumpap said some areas look like they have been "completely leveled."

"We've lost a lot of homes and we've lost a lot of business places and we've lost cultural and historic resources that were in the Chinatown that have burned to the ground," Tumpap said. "We are seeing fires unlike what we've ever seen before."

Tumpap cautioned travelers against coming to the island, saying it is "not going to be the Maui vacation that you planned" and visitors will have a hard time finding resources.