Internet communications in Syria have been largely taken offline, Internet monitoring services confirm.
Renesys wrote on Thursday morning, "In the global routing table, all 84 of Syria's IP address blocks have become unreachable, effectively removing the country from the Internet."
The disruption is said to have occurred at 12:26 p.m. local time in Damascus, Syria.
(Scroll down for charts.)
Reuters reports this is the worst communications disruption in the country since uprisings began a year and a half ago, and it happens ahead of an expected "military showdown" with Assad forces around Damascus.
"Syria is offline," information security specialist Chris Ginsley told WIRED.
It's not the first time Syria has experienced a widespread Internet blackout. In June 2011, Renesys observed the country had been widely disconnected from the Internet.
UPDATE: Here's another chart on the outage. This one from Arbor Networks Security.