It's already been a hard week for natural gas, but it looks like there's more pain to come.
Natural gas futures were hammered on Thursday, as government supply data showed the biggest weekly gain in inventories in four years. Supplies rose by 111 billion cubic feet, which was more than the 93 million to 97 million expected, and well above the 72 billion cubic feet we saw last week.
(Read More: US natural gas supplies grew last week)
Worse, the consequent downdraft happened to coincide with the break of a key technical level at $4, causing many long positions to liquidate.