This story was updated at 1:45 PM.

Growing in number and spirit, the Standing Rock Sioux protest against the Dakota Access Pipeline is swiftly gaining strength ahead of a federal hearing on the controversial project. Support has spread across the country, and thousands have descended on the peaceful "prayer camps" in recent days, prompting state officials on Monday to remove the demonstrators' drinking water supply.

North Dakota homeland security director Greg Wilz ordered the removal of state-owned trailers and water tanks from the protest encampment, despite the sweltering heat, because of alleged disorderly conduct, according to the Bismarck Tribune, including reports of laser pointers aimed at surveillance aircraft.

"People are getting overheated now already," said Johnelle Leingang, the tribe's emergency response coordinator, as temperatures hovered around 90º F on Monday. "It's very hurtful."

Tribal activists say the state's response, which includes surveillance, road blockades with military checkpoints, and a state of emergency declaration, has been overly aggressive and manipulative.

"It is deeply ironic that the Governor would release emergency funds under the guise of public health and safety, but then remove the infrastructure that helps ensure health and safety in the camp," said Tara Houska, national campaigns director for Honor the Earth.

The supplies were provided last week by the North Dakota Department of Health at the tribe's request to support the roughly 2,500 people now gathered along the Standing Rock reservation's border on the Cannonball River, near where the pipeline is slated to cross.

LaDonna Allard, director of one of the prayer camps, said, "The gathering here remains 100 percent peaceful and ceremonial, as it has from day one. We are standing together in prayer...Why is a gathering of Indians so inherently threatening and frightening to some people?"

"This is nothing but repression of our growing movement to protect our water and future generations," Houska added.

Standing Rock spokesman Steven Sitting Bear said he's received "notifications from tribes all over the country that have caravans in route, so it’s continuing to grow."

On Wednesday, high profile activists and supporters are rallying in Washington D.C. outside the U.S. District Court, where members of the Standing Rock Sioux will argue that the U.S. Army Corps of Engineers granted Energy Transfer Corporation approval for the 1,172-mile pipeline without tribal consent.

The tribe says that the pipeline—which will carry up to 570,000 barrels of fracked Bakken oil daily across four states to a market hub in Illinois—puts the sacred waters of the Missouri River at great risk.

Climate campaigner and 350.org co-founder Bill McKibben penned an op-ed on Monday offering a vision of "what it might mean if the if the Army Corps, or the Obama administration, simply said: 'You know what, you're right. We don’t need to build this pipeline.'"

"It would mean that after 525 years, someone had actually paid attention to the good sense that Native Americans have been offering almost from the start," he continues:

One has the ominous sense of grim history about to be reenacted at Standing Rock. North Dakota authorities—who are in essence a subsidiary of the fossil fuel industry—have insisted that the Sioux are violent, that they have "pipe bombs." There are rumors about calling in the National Guard. The possibility for renewed tragedy is very real. But the possibility for a new outcome is there as well. The Army Corps of Engineers might back off. The president might decide, as he did with Keystone, that this pipeline would "exacerbate" climate change and hence should be reviewed more carefully. We might, after five centuries, actually listen to the only people who've ever successfully inhabited this continent for the long term.

Construction on the pipeline remains halted after developers paused the project last week in anticipation of the Wednesday hearing.

Meanwhile, a U.S. District Court hearing on whether a preliminary injunction should be issued against the protesters has been rescheduled from Thursday to Sept. 8, although a restraining order against the demonstrators has also been extended until then. Filing the order on Monday, U.S. District Judge Daniel Hovland wrote that factions are '"strongly encouraged to meet and confer in good faith' to try and resolve the dispute out of court," the Tribune reported.

Updates are being shared on social media with the hashtags #NoDAPL and #RezpectOurWater.

Tweets about #nodapl OR #Rezpectourwater