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Fibre cuts impacted several countries (in particular Bulgaria, Turkey and Iran)  in the early morning on December 19th 2019 according to According to the BBC the issue lasted for about 2 hours on Thursday (2019/12/19) morning. Another report from Netblocks also identifies the problem as during the hours of 7am and 8am December 19, 2019


Looking at the 7 hosts in Iran (see that are monitored from SLAC we see in the spreadsheet a peak aggregate packet loss for the hours of  7 and 8pm GMT.