Authorities also have not said whether Pistorius called for help.

Pictures of his walk to a police car, his head covered by a sweatshirt, have flashed repeatedly across television screens.

On Sunday, Pistorius canceled his appearances in five upcoming races.

The move is meant to help Pistorius focus on the legal proceedings and "help and support all those involved as they try to come to terms with this very difficult and distressing situation," said Peet Van Zyl of Pistorius' management company, In Site Athlete Management.