This is the 5th running record broken in a week (2x 1 mile, 3k, 5k, and now HM), the other ones being indoor times that match the current outdoor records. I wonder if they will start banning certain shoe technologies during races now, but of course they cannot ban athletes from using illegal shoes during training.
[1] https://www.capitalfm.co.ke/sports/2015/04/13/ak-suspends-ro...
[2] https://www.reuters.com/article/sports/italian-agent-charged...