The trial of the six police officers charged with the murders of three Moruga friends in 2011 took another bizarre turn when the State's main witness was questioned about an alleged handwritten, signed statement she sent to the Director of Public Prosecutions on April 3, claiming she was the mastermind behind two of the murders and had threatened her colleagues.

For a third day, WPC Nicole Clement has refused to answer any question posed to her by lead prosecutor Gilbert Peterson, SC, and lead defence attorney, Israel Khan.

Throughout the entire day's sitting on Wednesday, she sat deadpanned in the witness box, only speaking to give the affirmation and to say she 'will not speak further on the matter.'

'I will not be saying anything…I have nothing to say,' she repeatedly told Peterson during his cross-examination of her which began after the testimony she gave at the Princes Town magistrates' court in 2013 at the preliminary inquiry into the murders was read out to the jury.

On Monday, Clement was deemed a hostile witness by Justice Carla Brown-Antoine, who is presiding over the trial at the Hall of Justice, Port of Spain.

Before the judge are Sgt Khemraj Sahadeo, along with PCs Ronald Riveiro, Glenn Singh, Roger Nicholas, Safraz Juman and Antonio Ramadhin.

The six are charged with the murders of Abigail Johnson, 23, Alana Duncan, 28, and Kerron 'Fingers' Eccles on July 22, 2011.

Clement was also charged with the murders but those charges were discontinued after she was given immunity to testify against her six colleagues.

From her evidence at the inquiry, she claimed two of the three Moruga friends - a man and woman - initially survived the 'gunfight' at Barrackpore and were taken to a lonely road off the M2 Ring Road, Woodland, where they were executed on Sahadeo's instructions.

Her evidence at the inquiry also detailed steps allegedly taken by her colleagues to cover up the killings and of her signing a report prepared by two of them which, she testified, was false.

Clement testified that she did so because it was 'normal police culture' where 'everyone sticks together and writes the same report … One squad, one song,'

During his cross-examination, Peterson recounted the evidence she previously gave and ended by suggesting to her it (her evidence at the inquiry) was truthful notwithstanding the position she has now adopted.

She remained silent.

She also refused to acknowledge drawings of the crime scenes based on what she told investigators during their probe of the incident.

Khan then began his cross-examination but asked that she be directed to take off the face mask she wore.

To her, he suggested she was now seeking to extricate herself from the three murders by giving 'false, sinister, wicked and diabolical' statements implicating the accused in the 'execution' of the three friends.

Unlike when she told Peterson she would not be responding to his questions, she remained expressionless and silent when questioned by Khan.

She only told him once, 'I wish not to say anyth