Construction crews began blasting sites in Organ Pipe Cactus National Monument as part of the construction of Donald Trump‘s US-Mexico border wall, with the affected areas including sites sacred to Native American groups, according to a Democratic congressman from Arizona.

Organ Pipe Cactus National Monument is an internationally recognised biosphere reserve, meaning it has plants and animals so rare that the United Nations has given it a special designation.

It includes about 330,000 acres of designated wilderness and is home to ancestral grounds sacred to the Tohono O’odham Nation, one of at least a dozen Native American groups that claim connections to grounds within the monument.

Raul Grijalva, a congressman whose district includes the reservation, said crews this week began blasting through parts of Monument Hill, which includes a burial site for the Tohono O’odham Nation.

“The construction contractor has begun controlled blasting, in preparation for new border wall system construction, within the Roosevelt Reservation at Monument Mountain,” US Customs and Border Protection (CBP) said, according to Associated Press.

Trump prototypes for Mexico border wall demolished in California Show all 20 1 /20 Trump prototypes for Mexico border wall demolished in California Trump prototypes for Mexico border wall demolished in California The prototypes for President Trump’s border wall are being demolished. AP Trump prototypes for Mexico border wall demolished in California The US Customs and Border protection had built the eight 30-foot tall steel and concrete models near San Diego on the US-Mexico border. Reuters Trump prototypes for Mexico border wall demolished in California A 2018 report from the Government Accountability Office found that the construction challenges presented by the four concrete models would be “extensive” and those presented by two of the other models would be “substantial”. Reuters Trump prototypes for Mexico border wall demolished in California It was intended that Mr Trump would choose his favourite of the designs after testing had been completed. AFP/Getty Trump prototypes for Mexico border wall demolished in California The President is yet to comment. AFP/Getty Trump prototypes for Mexico border wall demolished in California Each prototype cost $300,000 to $500,000 to build and they are being knocked down in order to make way for the San Diego Secondary Wall project which will see up to 14 miles of barrier being built to support the existing steel border fence. AP Trump prototypes for Mexico border wall demolished in California The new barrier will not employ the design of any of the prototypes, instead being built of the favoured steel bollards which make up the current section of the wall at San Diego. Reuters Trump prototypes for Mexico border wall demolished in California The new secondary barrier being built near San Diego. Reuters Trump prototypes for Mexico border wall demolished in California The rubble of one of the demolished prototypes. Reuters Trump prototypes for Mexico border wall demolished in California A steel wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A wall prototype made from a mix of steel and concrete AFP/Getty Trump prototypes for Mexico border wall demolished in California A wall prototype made from a mix of steel and concrete AFP/Getty Trump prototypes for Mexico border wall demolished in California A concrete wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A steel wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A concrete wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A concrete wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A concrete wall prototype AFP/Getty Trump prototypes for Mexico border wall demolished in California A digger approaches the prototype wall AFP/Getty Trump prototypes for Mexico border wall demolished in California Aerial view of the wall prototypes at the US-Mexico border after they were torn down AFP/Getty Trump prototypes for Mexico border wall demolished in California An aerial view showing Tijuana, Mexico on the left and the demolished wall prototypes on the right AFP/Getty

“The controlled blasting is targeted and will continue intermittently for the rest of the month.”

Mr Grijalva, the chair of the House Natural Resources Committee, visited the location ahead of the construction and described the site in a video posted to social media.

Monument Hill, where he said explosions are now occurring, is a site where members of the Tohono O’odham Nation have buried members of opposing tribes.

“Where they were blasting the other day on Monument Hill is the resting place for primarily Apache warriors that had been involved in battle with the O’odham,” he said. “And then the O’odham people in a respectful way laid them to rest on Monument Hill.”

The CBP said there is an “environment monitor” at the blast sites, where there is also “ongoing clearing activities”, but it did not provide additional details, according to CBS News.

The department did not respond to The Washington Post‘s request for comment and clarification about which sites are in the path of the blasts this month.

Trumps US-Mexico border wall falls down in high winds

Before his visit, Mr Grijalva sent a letter to the acting head of the Department of Homeland Security (DHS), Chad Wolf, to express “serious concerns” about the construction project.

“Members of the Tohono O’odham Nation recently informed me that the Department of Homeland Security is not respecting tribal lands and sacred sites as they proceed with border wall plans and construction,” he wrote in January.

“I strongly urge DHS to conduct meaningful government-to-government consultation with the Tohono O’odham Nation about the DHS’s planned border wall construction.”

Mr Grijalva said no such consultation has taken place.

“There has been no consultation with the nation,” he said. “This administration is basically trampling on the tribe’s history – and to put it poignantly, its ancestry.”

Laiken Jordahl, who works on border issues at the Centre for Biological Diversity, said that crews have “butchered” parts of the mountain.

“It is completely different from what it has been before – there’s a swath of land gone from right in the middle,” he said.

“[T]he Nation categorically opposes the barrier construction projects, because they directly harm and threaten both the lands currently reserved for the Nation ... and its ancestral lands that extend along the international boundary in Arizona,” Ned Norris, chairman of the Tohono O’odham Nation, said in an accompanying letter to the CBP’s Tucson sector chief.

Mr Grijalva said that he has not received a response from the DHS.

In addition to concerns about sacred grounds, environmental advocates – and members of the US government – have warned about the potential destruction of other sites and wildlife in the area as a result of construction.

An internal National Park Service report found that construction of Mr Trump’s wall could destroy up to 22 archaeological sites in Organ Pipe Cactus National Monument.

“In addition to the sacred sites like Quitobaquito Springs, the entire monument is ancestral lands. The tribe uses it to gather plants, they still actively use it for ceremony, the entire landscape is sacred to the tribe,” Mr Jordahl said.

“They are ploughing over ancient saguaro cactuses, 200-year-old cactuses, chopped up like firewood – it is appalling,” he added. “They are also sacred to the O’odhom; they see them as the embodiment of their ancestors. So to see them turned into mulch – it is deeply upsetting.”

Crews have cleared some plants, as well as the saguaros, and moved them to other locations as they work within the national monument, according to local media.

But Mr Jordahl shared images with The Post of some saguaros that he said have been destroyed.

He pointed to the Trump administration’s move to use its authority under a 2005 law to bypass environmental rules and other laws in its efforts to construct the border barrier – a decision he says enables it to disturb wildlife or sacred sites.

Mr Grijalva cited the 2005 law in his January letter, too, which he said allows the administration to waive requirements such as tribal consultation.

“[T]his administration continues to use its waiver authority at an unprecedented and irresponsible rate. Of the 21 times the waiver has been enacted since 2005, 16 of those instances have occurred in the last two and a half years,” he wrote.

The congressman said he plans to hold a hearing this month on the border construction’s impact.

“There is urgency, and time is of the essence in order to try to work with our friends in the O’odham Nation to preserve, conserve and leave the identity intact,” he said.