A Lebanese security source told Reuters that Hezbollah believed it was ordering the pagers from Gold Apollo and that they were produced in Asia, not Europe.

Her door was ajar on Wednesday but closed on Thursday morning, said a Reuters reporter at the scene. No one answered the doorbell.

Barsony-Arcidiacono of BAC Consulting, the Budapest-based company that was also linked to the sale of the pagers, vacated her apartment in Budapest on Wednesday, a neighbour told Reuters.

His neighbours in a quiet suburb of Oslo said they didn’t know much about him. Amund Djuve, the CEO of DN Media, where Jose currently works, told Reuters he was aware of the reports and had alerted the police and security services. He said that Jose was travelling in the U.S.

Norta's founder, Rinson Jose, is based in Norway. He declined to comment on the pagers when reached by phone and hung up when asked about the Bulgarian business.

"Are you looking for an agile company to help you succeed or to find that tech solution just right for you? Look no further," the website had said, according to copies of the website reviewed by Reuters before it was altered.

Content on Norta Global’s website, globalnorta.com, was deleted on Thursday. The website previously had English, Bulgarian and Norwegian language versions, and advertised services including consulting, technology integration, recruitment and outsourcing.

A lawyer, Vladimir Kuzmanov, who said he represented the company, was present at the address but declined to respond to questions when approached by Reuters on Thursday.

Norta's Bulgarian headquarters are registered at an apartment building in the capital Sofia that is also home to nearly 200 other companies, according to a local company registry. There was no sign of Norta.

Bulgaria and Norway now in focus. The Hungarian firm which allegedly facilitated the deal did so on behalf of a firm in Bulgaria, owned by a Norwegian national. That firm, Norta Global Ltd, moved 1.6 million euros to Hungary, per Bulgarian security service.