"Mr Pistorius said to me, 'security, everything is fine'," testified lead guard at the estate, Pieter Baba.

Oscar Pistorius told a security guard everything was fine after shots were heard from his house the morning Reeva Steenkamp was killed, the High Court in Pretoria heard on Friday.

"Mr Pistorius said to me, 'security, everything is fine'," testified lead guard at the estate, Pieter Baba.

"I heard that he was crying," he said.

He told a colleague with him that he was sure that something was wrong.

Pistorius phoned him back and Pistorius just started crying over the phone and the line cut.

"I immediately told Jacob everything is not right."

Pistorius is on trial for the murder of Steenkamp, whom he shot dead through a locked bathroom door in his Pretoria home.

He says he mistook her for an intruder.

The State argues it was premeditated murder.