The pilot of the private jet that crashed early Thursday morning in Tierrasanta, killing all six people on board and injuring eight people on the ground, did not declare an emergency or call in any type of mechanical issue with the plane before it clipped a power line and slammed into a residential street, federal authorities said Friday.

The NTSB is yet to confirm a cause of the crash, although highlighted two major factors that could have led to the tragedy

The runway lights were out, a weather alert system wasn’t working and there was heavy fog at a San Diego airport when a pilot who had flown across the country made the decision to proceed with landing but came up short and crashed into a neighborhood.