Oscar Pistorius trial day one: Athlete 'explains shooting'

South African athlete Oscar Pistorius has denied "in the strongest terms" murdering his girlfriend Reeva Steenkamp, at the start of his trial in Pretoria.

When asked for his plea to the charge of murder, Mr Pistorius told the judge: "Not guilty, m'lady."

A defence lawyer then read a statement on Mr Pistorius' behalf, reiterating his version of events at his home in Pretoria on 14 February 2013.

State prosecutors allege the killing was premeditated, but he claims he mistook her for an intruder, and was trying "to defend Reeva".