( CNN ) A friend of Bobbi Kristina Brown said police have questioned Brown 's boyfriend about bruises on the young woman 's chest after she was found unresponsive in a bathtub January 31 . Brown , the only daughter of the late Whitney Houston , remains in a medically induced coma in a neuro intensive care unit at Atlanta 's Emory University Hospital . Monday night , friend Daphne Barak said that Nick Gordon , Brown 's boyfriend , told her that the bruises were a result of him performing CPR on her . Gordon could not be reached for comment . The investigation is focusing on everyone who was in the house the night before the incident and on people who had contact with Gordon , according to a source with knowledge of the probe . Police are exploring all avenues to find out how and why Brown ended up face down in her bathtub with unexplained injuries to her body , the source said . `` Immediately , from the beginning , they asked him about injuries to the chest , '' Barak told HLN 's Nancy Grace , adding that Brown is `` very tiny . '' Her father 's attorney released a statement criticizing the media for `` false reports . '' `` The desire to be 'first ' has clouded the judgment of many reporters as they forgo accuracy . This is a criminal investigation and the integrity of that process requires silence , '' Christopher Brown said . Police did n't call the case a criminal matter until Tuesday night . `` I can confirm that we have a criminal investigation ongoing , '' Roswell Police Chief Rusty Grant said in an email sent to CNN . Barak has been in close contact with the couple for more than a year , she said , adding that she believes Gordon and Brown were very much in love . `` These two young people -- he was everything for her , she was everything for him . ... They really were everything to each other , '' Barak said . Last week , a source close to the Brown family told CNN that Brown has injuries that need to be explained , but there have been no details disclosed publicly about the nature of those alleged injuries . `` I 'm praying for her , '' Barak said . Houston died three years ago Wednesday . She was found dead in a bathtub at a hotel near Los Angeles on February 11 , 2012 , hours before she was to attend a pre-Grammy Awards party . A coroner ruled her death an accidental drowning , with heart disease and cocaine use listed as contributing factors . CNN 's Marylynn Ryan contributed to this report .
Police confirm a criminal investigation is underway into the near-drowning incident . The boy was found unconscious in his family's home on Monday and taken to hospital where he later died. Whitney Houston 's daughter was found unresponsive in bathtub January 31 .