The helicopter carrying Kobe Bryant and eight others that crashed into a rugged hillside outside Los Angeles was flying in foggy conditions considered dangerous enough that local police agencies grounded their choppers.

The helicopter plunged into a steep hillside yesterday with an impact that scattered debris over an area the size of a football field and killed all aboard.

The accident unleashed an outpouring of grief from admirers around the world who mourned the sudden loss of the all-time basketball great who spent his entire 20-year career with the LA Lakers.

Thousands of fans, many wearing Bryant jerseys and chanting his name, gathered outside the Staples Center in downtown Los Angeles, home of the Lakers and site of the Grammy Awards where Bryant was honoured.

Bryant, who perished with his 13-year-old daughter, Gianna, was one of the game’s most popular players and the face of the 16-time NBA champion Lakers.

The cause of the crash was unknown, but conditions at the time were such that the Los Angeles Police Department and the county sheriff's department grounded their helicopters.

The Los Angeles County medical examiner, Dr Jonathan Lucas, said the rugged terrain complicated efforts to recover the remains. He estimated it would take at least a couple of days to complete that task before identifications can be made.

[Source: TVNZ / Associated Press]