SpaceX Falcon 9 exploded during a pre-launch test in Sept. 1. The incident was triggered by a faulty helium pressurisation system inside the liquid oxygen tank - the company confirmed on Friday. 

Elon Musk owns and operates SpaceX. The technology entrepreneur was fuelling Falcon 9 rocket on Sept. 1 on the launchpad in Florida. The company was preparing for a test-firing  when a bright fireball was seen in the rocket's upper stage. 

The data review and fault-tree analysis indicated an unspecified problem. The results were not related to the internal strut failure that released the second stage helium pressurization bottle on June 28, 2015 during its launch.

The helium bottle shot to the top of the oxygen tank, which caused the second stage to break apart and therefore destroying the rocket and a space station-bound cargo ship. 

"At this stage of the investigation, preliminary review of the data and debris suggests that a large breach in the cryogenic helium system of the second stage liquid oxygen tank took place," confirmed by SpaceX.

The second stage helium system on Sept. 1 explosion was caused by a different problem. 

"We have exonerated any connection with last year's ... mishap," SpaceX said in Friday's statement.

Dex Torricke-Barton, SpaceX spokesman, did not mention anything on what caused the breach of the helium system. He added that the company was still investigating the issue. 

The explosion was heard 30 miles (48 km) from the SpaceX's launch pad 40 at Cape Canaveral Air Force Station.  Noone was fortunately hurt during the incident. 

The damage during the Sept.1 incident has affected "substantial areas" of SpaceX  primary launch site. Other important areas however have remained unaffected. 

The company confirmed that they are still repairing the damages however did not provide information on the costive damage or how long SpaceX will be out of service.