The majority of Syria's internet has been taken offline, according to internet monitoring firm Renesys.
On Friday, routes to 40 out of 59 Syrian networks were withdrawn, according to the Renesys blog. The internet in Syria depends on the state-owned SyriaTel.
This left some government websites up, but disabled 3G mobile data networks, said Renesys.
Google's Transparency report shows Syrian internet requests flatlining on Friday.
Thousands protested against the Syrian government on Friday, with troops reportedly killing 34 people, said the BBC.