EIA reported a build of 83 Bcf for the week ending 9/10/2021. This was larger than the median estimate of 76 Bcf. Today's stat fell outside the expected range, which was 81 Bcf on the more bearish end, and 70 Bcf on the more bullish end.
Prices were down in the five minutes following the announcement, to $5.268, from $5.306 just before 9:30am.