One of the two boys accused of the murder of 14-year-old Ana Kriégel told gardaí the other boy was planning to kill her but that he did not think he was going to do it.

Boy B told interviewing gardaí that Boy A had said a month previously that he was planning to kill Ana Kriégel. But Boy B said he didn't think his friend was being serious.

The two teenagers deny murdering the schoolgirl in a derelict house in Lucan on 14 May last year. Boy A also denies violently sexually assaulting her.

Boy B also told gardaí he saw Boy A wearing a homemade "zombie" mask while he was choking Ana and agreed he had seen Boy A in what gardaí described as his "murder kit". He said he was "ashamed" of running away and really wished he had helped her.

The jury were shown interviews carried out with Boy B after his re-arrest on 7 July last year, on suspicion of murder.

The second accused boy was quizzed by gardaí about a backpack carried by the first accused boy. They told him they had found it in Boy A's home and asked Boy B about the items found in it - gloves, shin pads, knee pads, a snood or neck warmer, and a homemade mask.

The then 13-year-old boy said he knew about the mask - he said it was a "zombie mask" that Boy A had made for Halloween. Boy B said he himself had worn it before and it was "really cool". He told gardaí at first that he had never seen Boy A wearing it and hadn't seen it on 14 May, when he saw Boy A choking Ana in an abandoned house.

Eventually, the boy told gardaí that he had seen Boy A wearing the mask on that day, but did not know if the boy put it on before or after he went into the room where Ana's body was later found or before or after he "took down Ana".

He said he had seen the mask a couple of days beforehand in Boy A's house. And he said Boy A was wearing it for the "whole incident" in the room. The boy later said he thought his friend was also wearing the knee pads and shin guards.

Boy B said his friend had asked him to get Ana from her house and bring her to meet him for "relationship reasons".

Gardaí suggested that the items in the backpack did not suggest a meeting about relationships. Boy B said Boy A was planning to kill Ana, but he did not know beforehand that he was actually going to kill her.

Boy B told gardaí that about a month previously, Boy A told him that he was going to kill Ana. Boy B said he did not think the first boy was being serious.

He described how he was sitting down when Boy A came up to him and said "hey, wanna kill somebody". Boy B said he replied "no" and his friend said "ah here, why not?". Boy B told gardaí he replied "because it's retarded" and his friend said "oh fine".

Boy B said he asked Boy A who he was planning to kill and his friend answered, Ana Kriégel. Boy B said he replied "in your dreams" and the first boy just left. Boy B said he didn't think his friend was being serious.

He said it was not something you would usually hear from Boy A, he thought he was joking. Later he told gardaí that he and his friends joked around like that all the time but never meant it seriously.

Gardaí put it to him that in his own words, he had "handed Ana over to Boy A" at the abandoned house.

He said he did not know what Boy A was going to do - he thought it was just a friendly request to bring Ana to the park.

Asked why he did not do anything to help, he said he was scared and shocked, and his brain was "frozen". He said he was scared to tell anyone and in the following days he tried to pretend nothing had happened. He said he was scared of being framed by Boy A.

He said he was "ashamed" of running away and not helping. His brain had stopped working and the only thing he could think of was to go home, he said.

He told gardaí later that when he went home he finished his homework, continued watching his animated series and tried to forget what happened.

He said when gardaí called on Tuesday morning to his home, he was too scared to tell them what had happened. He said he knew he could have saved Ana, and said he did not know why he didn't try to save her.

The boy said he was scared to admit to the gardaí that he didn't help her and that he was too stupid to realise what was going on.

He said he was also scared of what Boy A could say or do to him if he did tell and was scared of Boy A framing him in some way.

He also told gardaí that when the guards first asked him what had happened, his mind went blank and he could not remember so he lied.

Later he remembered what happened but thought to himself that he couldn't go back on his previous story.

Gardaí put it to him that he had led them a merry dance in the days before Ana's body was found and that he had not told them that he was at the abandoned house until the second day of his first arrest on 25 May.

The boy said that he realised he had to tell "for things to be right" but he said nothing after gardaí suggested to him that his conscience was not at him and that he only changed his story after they presented all the facts and evidence to him.

He said he had not seen his friend attacking Ana - he said he "only saw him flip her over to the ground and choke her" and take off her clothes. Boy B insisted he had not seen Ana bleeding. And he said he did not know how her blood was found on a top that he had seen Boy A throw across the room.

He said from his point of view, he did not see any blood and told gardaí he didn't want to speculate. He agreed he had seen Boy A in what gardaí described as his "murder kit".

The boy said he hadn't told gardaí before that Boy A had pulled down Ana's trousers while wearing a zombie mask and shin pads, because he was shocked and forgot.

He was asked how he could forget seeing such a thing. He told them he was scared and shocked and when he got home, all he wanted to think about was to forget about it, make things back to the way they were, "turn everything back and try and forget about it".

He told gardaí he didn't know the mask and other details were important. He claimed Boy A usually wore "weird stuff".

He denied that he knew what he was bringing Ana to the house for. And said "no" when gardaí suggested that he had "brought the prize" and had lured Ana to her death. He denied being part of the murder and bringing Ana to the house to be killed. He said he did not think Boy A would murder Ana. He said he did not want to think it.

He said when he ran away, he kept thinking to himself, "this can't be happening, this isn't real". He said he kept thinking his friend wouldn't do such a thing and that it wasn't like him. He told the gardaí he did not know why Boy A had targeted Ana.

Gardaí asked him again why he had done nothing to help Ana during the attack. Boy B said he knew Ana but was not friends with her. He said he didn't know what to do. When he looked back now, he realised he should have helped her. And he said gardaí did not know how many times his dad had told him that. He said he really wished he did help her.

The boy said he had given the tape found at the scene to Boy A couple of days previously because Boy A had asked for it, and he thought he wanted to make something.

Boy B said he could see why gardaí believed he was involved in the murder. Gardaí told him he had told them lie after lie after lie, and when he was in a corner he tried to wiggle out of it by telling a story to suit. The boy insisted he had told gardaí the truth. He said he told them everything he knew, everything he saw, everything he remembered.

The jurors have now finished watching the interviews. Evidence in the case will resume tomorrow.