Ariel Castro's brother: 'I hope he rots in jail' Pedro and Onil Castro said they were prevented from entering certain parts of their brother's house Video: CNN The brothers of the suspected Cleveland kidnapper Ariel Castro have revealed that he prevented them entering parts of the house where three women were allegedly held captive for a decade by telling them he only heated the kitchen in an effort to reduce the gas bill. Pedro and Onil Castro, who were released from police custody last Thursday having been cleared of any involvement in the kidnappings, have cast light on the methods used by their brother to disguise the fact that he had three young women and a child hidden in the back of his home. For 10 years no visitors were allowed to go further than the kitchen, and music was always playing to obscure sounds in the house. He said he wanted to keep the heat in the kitchen because the gas bill. The radio was playing all the time, if not the radio, the TV. Something had to be on all time in the kitchen," Pedro Castro, 54, told CNN. http://www.cnn.com/2013/05/13/us/ohio-castro-brothers/index.html?hpt=hp_t1. The two brothers were initially suspected of having been accomplices in the kidnappings, in which Michelle Knight, now 32, was held since 2002; Amanda Berry, 27, since 2003 and Gina DeJesus, 23, since 2004. But detectives became convinced they were as unaware as anybody else of the secret activities of Ariel Castro. The brothers are now in hiding themselves, having been subjected to death threats and intimidations over the past few days. They told CNN that rocks had been thrown through the windows of their homes. "I would have went straight to the police if I seen anything, if I seen a curtain move or if I heard anything because there's nobody there inside that house," Onil Castro, 50, said. He called his brother a monster: "This monster is a goner. I hope he rots in that jail. I don't even want them to take his life like that. I want him to suffer in that jail to the last extent. I don't care if they even feed him. Knight, Berry and DeJesus have now all been released from hospital into the care of family. The three women have put out a joint statement through their lawyers in which they "pleaded with privacy at this time so that they can continue to heal and reconnect with their families." They said there "may be a time, at some point in the future" when they would tell their stories, but it would not be until the prosecution of Ariel Castro was over. Cleveland authorities are currently preparing to assemble a grand jury to which the charges and basic evidence in the case would be presented. Castro, 52, has so far been charged with rape and kidnapping, but prosecutors have indicated they are likely to add "aggravated murder" relating to multiple miscarriages suffered by the women in the house. Aggravated murder carries a possible death sentence, though it would be difficult to prove and could open a verdict to challenges under the US constitution. Federal investigators have erected a 10ft-high fence around Ariel Castro's home on Seymour Avenue, Cleveland, to protect it from contamination ahead of any trial. There have been reports of threats to burn the house down. In their CNN interview, Pedro and Onil Castro described the moment they were told what their brother was alleged to have done. Onil was shown pictures of women by police who he didn't recognize because they looked so malnourished. Oh, it was just heart-dropping. Just terrible when they said that, when he said: 'It's Amanda Berry and Gina DeJesus, and they were in your brother's house'. It was all the more shocking, he said, because the Castro family knew the family of Gina DeJesus and Onil would often ask her father, Felix, whether there was any sign of her. Onil Castro said that Ariel was always "a little apart" within the family, and "strange to me all through our lives." He was wrapped up in his music - he played bass guitar in a salsa band - and often they wouldn't see him for weeks. Pedro Castro said that he had seen his brother outside the house in the company of the six-year-old girl, who it is now known was fathered by Ariel. I seen Ariel with a little girl at McDonald's and I asked him: who's that? And he said: 'This is a girlfriend's of mine'.