Director of national intelligence James Clapper said the United States still can’t be certain how much harm was done to intelligence collection by the revelations of disaffected National Security Agency contractor Edward Snowden, The Washington Post reported on Wednesday.

“We’ve been very conservative in the damage assessment. Overall, there’s a lot,” Clapper said, noting that the Snowden disclosures made terrorist groups “very security-conscious” and speeded the move to unbreakable encryption of data. And he said the Snowden revelations may not have ended: “The assumption is that there are a lot more documents out there in escrow [to be revealed] at a time of his choosing.”

Source: MENA