My math may be wrong, but at that speed the object should have weighed around 14 tons to release that much energy.
The Chelyabinsk meteor had an estimated weight of 10,000 tons and exploded with a force of 500 Kt. If the energy scaled with the square of the mass that would be about 6.3 tones. I think.
There was a similar explosion, 2.8 Kt, right over the heart of Germany in June. The Air Force didn't mention that one either and it was larger and a lot closer to populated areas. This sort of thing happens several times a year and usually doesn't get much notice.