U.S. intelligence officials have linked North Korea to last month’s hack on Sony, concluding they are “centrally involved,” American broadcaster ABC News reports.

The U.S. government is expected to make an official statement on the hack today, but officials told ABC news that FBI and intelligence investigations found evidence the attack was routed through computers in Singapore, Thailand, Italy, Bolivia, Poland and Cyprus, but directed from North Korea.

Experts believe that while hackers are very difficult to track down, North Korean involvement is possible.

“On the reports of NK involvement, I think we should wait and see what the U.S.