Native American burial sites in Arizona have been blown up by construction crews building the US-Mexico border wall, according to lawmakers and tribal leaders. Authorities confirmed that "controlled blasting" has begun in Organ Pipe Cactus National Monument, a Unesco recognised natural reserve. Raul Grijalva, a Democrat congressman, called the destruction "sacrilegious" noting that the government failed to consult the Tohono O'odham Nation. One area contained artefacts dating back 10,000 years.