State Police were called to a Mercer County tear gas manufacturer early Monday morning where protesters blocked the entrance.

Police characterized the protest at Combined Systems Incorporated as “peaceful,” saying protesters were keeping employees from entering the business.

"We're coming to the source to put CSI on notice that the people are aware of the harmful things that are being created in this factory," Meejin said, a protester from New York City.

One protester claims the tear gas used by local police in Philadelphia was made by CSI. 

"We hope that CSI realizes that there is public opposition to them making money from poisoning neighborhoods," John Bergen said.

Kinsman Road (Route 58) was closed between Hughes Road and Sugar Run Road for several hours. It was later reopened following the arrest of several individuals Monday afternoon.

About 25 to 30 protesters were on the site, but most eventually left when police arrived.

Pennsylvania State Police brought in a negotiator to convince the remaining protesters to leave the property, who were handcuffed together with a plastic tube covering their hands and arms over top.

Police had to bring in a generator to power a tool to cut the tubes to reach the handcuffs. 

"They made it clear that they had no intentions of removing it, from the looks of it I don't think they could have removed it themselves," Trooper James Long said.

Trooper Long says three women and two men will face riot charges and one of them will also face a charge of criminal trespass.

A Facebook post from the New York-based group, the War Resisters League, shows a photo of five demonstrators handcuffed to each other, sitting in front of the plant gate.

The action aims to shut down CSI for the day to protest what organizers say is the use of tear gas at Black Lives Matters demonstrations in the U.S.

Along with the blockade, activists have posted signs naming more than 100 cities where tear gas was allegedly used.

According to its website, CSI is the premier supplier of less-lethal munitions and launching systems, manufacturing products for riot control, police tactical teams, corrections officers, and military units.

A recent investigative report published by USA Today and Kaiser Health News found that so-called “less-lethal” weapons have been known to blind, maim, and kill.