The source of the Hezbollah pagers that exploded in Lebanon, killing at least 12 people and injuring as many as 2,800 others, remained a mystery on Wednesday, after a Taiwanese company and the government of Hungary denied links to the devices, Paralel.Az reports citing Washington Post.

Two photos published to social media after the Tuesday explosions show the burned and damaged back panels of pagers with “GOLD” written in text above a model number, “AR-9.” The design of the text matches that emblazoned on the back of the “AR-924” pager model produced by Taiwanese pager manufacturer Gold Apollo Co.

Gold Apollo, however, said it did not design or manufacture the devices in question. It said those pagers were “entirely handled” by a Hungarian company called BAC Consulting KFT, which was authorized to use Gold Apollo’s brand trademark in some regions.