FBI investigators cannot access the contents of the mobile – two months after the Muslim couple shot 14 people dead at a Christmas party. Syed Farook, 28, and his wife Tashfeen Malik, 29, are thought to have been inspired by the warped Islamic State terror group. And James Comey, the director of the US security service, said the use of encryption technology was to blame for slowing down the probe.

The wider use of encryption is “overwhelmingly affecting” law enforcement operations, he told the Senate Intelligence Committee. He said: “It affects cops and prosecutors and sheriffs and detectives trying to make murder cases, kidnapping cases, drugs cases. “It has an impact on our national security work but overwhelmingly this is a problem local law enforcement sees.” READ MORE