The nationwide shutdown of the internet by authorities in Iran, which activists fear is aimed at masking the true scale of a crackdown on protests, has now lasted a full week, a monitor said Thursday.For all the latest headlines, follow our Google News channel online or via the app.“Exactly one week ago... Iran fell into digital darkness as authorities imposed a national internet blackout,” Netblocks said in a social media post. Read more:US lowers security alert at Qatar air base, sources say