A chorus is growing against Pennsylvania-based NonLethal Technologies Inc. for selling riot gear to Hong Kong that is being used against pro-democracy protesters.

The privately held company, which makes and exports a wide range of riot and crowd control equipment for military and law enforcement agencies, has been in the spotlight ever since it was discovered that Hong Kong police are employing its tear gas canisters to disperse anti-government demonstrations.

In one photo that has been widely shared on social media, NonLethal's name is stamped on the casing of a spent tear-gas canister.