WASHINGTON (AFP): Even after Washington pointed the finger at North Korea for the massive cyberattack on Sony Pictures, some experts say the evidence is far from clear cut. President Barack Obama earlier this month took the unusual step of naming North Korea for the crippling attack, while promising that the United States would “respond proportionately” after the FBI said evidence pointed to Pyongyang.

But a number of cybersecurity specialists argue that links to North Korea are uncertain, and that some evidence leads elsewhere.