Holding a banner reading “We won’t stop—There’s too much at stake,” demonstrators shut down morning traffic at an office park outside Pittsburgh on Monday, in protest of the harmful effects 15 energy companies in the complex have on the environment.

The protesters set up two tripod structures in the middle fn a main intersection leading to Southpointe, a 589-acre property in suburban Washington County, Pennsylvania—home to companies including Halliburton, Chesapeake Energy, and Range Resources, all of which participate in fracking and mining.

Two community members climbed onto the tripods while three others sat between them with their arms in lockboxes for about four hours before police broke up the demonstration, according to Rising Tide North America, a grassroots environmental group.

A woman who was seated between the structures said the companies that operate at Southpointe are “impacting our lives every day in our communities. I’ve been run off the road twice because of truck traffic. I have to wonder about the health of my daughter every day living within a half mile of gas wells.”

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She added that “the coal operator here is also destroying our only state park,” referring to the efforts of Consol Energy, another company at Southpointe, to obtain a mining permit for Ryerson Station State Park.

A community member named Patrick Young said that the disruption of traffic into the office park can’t be compared to the damage being done by the companies.