Canadian police have made around 40 arrests after violent clashes at an anti-fracking protest near a native reserve in the east of the country.
Efforts to dismantle a highway barricade led to trouble with several police vehicles set on fire.
It followed weeks of protests by activists and aboriginals who blocked a road near Rexton.
SWN Resources is exploring shale gas potential in the area.
Royal Canadian Mounted Police (RCMP) officers who moved in to break up the blockade said they were attacked with Molotov cocktails and at least one shot was fired, but not by them.
Protesters said however that police had moved in aggressively on unarmed people opposed to fracking.
"The RCMP is coming in here with their tear gas - they even had dogs on us," said Susan Levi-Peters.
"They were acting like we're standing there with weapons, while we are standing there, as women, with drums and eagle feathers. This is crazy. This is not Canada."
Police however defended the arrests, citing "serious criminal acts" being committed.
Members of the Elsipogtog reserve have long opposed SWN's efforts to explore for gas in the region.
They want a moratorium on shale gas exploration and say the company did not consult them before starting work.
Ms Levi-Peters said six police vehicles were burning in the street and that the aboriginal chief and others from a local reserve had been arrested.
The RCMP said dozens of people were arrested on various charges, including weapons offences, mischief and refusing to abide by a court injunction.
"The RCMP has worked diligently with all parties involved in hopes for a peaceful resolution," said Constable Jullie Rogers-Marsh.
"Those efforts have not been successful. Tensions were rising and serious criminal acts are being committed."
The protests have been buoyed by the "Idle no More" movement, a grassroots effort to bring more attention to the poor living conditions on native reserves and to help aboriginal communities gain more control over natural resource projects.