Major social media services including Facebook, Instagram and WhatsApp were hit by a massive outage on Monday, tracking sites showed, impacting potentially tens of millions of users.
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On Monday, construction work on the new inner-city security system began, and the first electric blockades are expected to be installed by December.
The EU's drug watchdog on Monday approved booster doses of the Pfizer/BioNTech Covid vaccine for all people aged 18 and over, amid concerns that protection dips after initial jabs.
The latest figures from Luxembourg show that 195 new cases of coronavirus were discovered over the last 72 hours.