The trial against Australian national Jock Palfreeman, accused of stabbing to death a 20-year-old in Bulgaria, was postponed on Thursday after two witnesses failed to turn up in the court room.

Paul "Jock" Palfreeman, 21, is behind bars in a Bulgarian jail after being charged with murder after an alleged street brawl in the capital Sofia at the end of 2007.

Palfreeman also faces a charge of attempted murder over the alleged stabbing of a 19-year-old man during the fight.

The Sydneysider denies both charges and says he was trying to defend himself from being attacked by a group of men.

One of the policemen, who came to the site of the murder, took the stand at Sofia City Court on Thursday. He explained that his team was the last to arrive at the crime scene after being told by colleagues that a group of young men had attacked a Roma, whom Palfreeman tried to defend.

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