https://www.bgpmon.net/massive-route-leak-cause-internet-slowdown/
So in conclusion, what we saw this morning was a major BGP leak of 176,000 prefixes by Telekom Malaysia to Level3. Level3 erroneously accepted these prefixes and announced these to their peers and customers. Starting at 8:39 and lasting for about 2 hours traffic was being redirected toward Telekom Malaysia, which in many cases would have been a longer route and also caused Telekom Malaysia to be overwhelmed with traffic. As a result significant portions of traffic were dropped, latency increased and users world wide experienced a slower Internet service.