US foreign surveillance requests doubles: Microsoft

FISA orders are tightly guarded national security secrets

Microsoft Corp said on Thursday it had received at least a thousand surveillance requests from the U.S. government that sought user content for foreign intelligence purposes during the first half of 2016.

The amount, shared in Microsoft's biannual transparency report, was more than double what the company said it received under the Foreign Intelligence Surveillance Act (FISA) during the preceding six-month interval, and was the highest the company has listed since 2011, when it began tracking such government surveillance orders.

The scope of spying authority granted to US intelligence agencies under FISA has come under renewed scrutiny in