PITTSBURGH (KDKA) – The PWSA says a private utility water line running under 10th Street near the sinkhole downtown was improperly capped.

It remains unclear if that line was leaking before the collapse and if that’s what caused the roadway to give way.

READ MORE: 'I Just Got A High IQ:' Antonio Brown Downplays Mental Health Issues To 'CBS Mornings'

(Photo Credit: NewsChopper 2/KDKA)

Investigators on Thursday say it’s too difficult to determine and we may never know.

READ MORE: High Winds Fan Flames Of 4-Alarm Fire At Former Butler Co. Business

While crews continue work underground, they also discovered some damage on Wednesday to a 48-inch storm sewer and 6-inch privately-owned commercial water service line.

In the same way that it’s hard to tell if the leaking line caused the collapse or if the collapse caused the leaking line, it’s difficult to determine if the damage to the infrastructure happened before or after the collapse.

MORE NEWS: Kennywood, Sandcastle, Idlewild Looking To Hire More Than 2,000 Workers For Upcoming Season

The sinkhole is expected to take weeks to repair.