New York ( CNN ) -- Prosecutors said Friday they treating an incident in which a woman allegedly killed herself and her three young children by driving her minivan into the Hudson River as a triple murder and suicide . `` Based on all the information available , there is no one else who can be held criminally liable in this case , '' said Orange County District Attorney Frank Phillips in a statement . It may take weeks before the autopsy findings are completed due to the need to receive toxicology results , Phillips added . The sole survivor in Tuesday 's tragic incident was 10-year-old Lashaun Armstrong , who escaped the sinking vehicle where his mother Lashonda Armstrong , 25 , as well as his siblings -- an 11-month-old girl , a 2-year-old boy and a 5-year-old boy -- all died . Police say an investigation into the incident suggests that the mother intentionally drove the vehicle into the Hudson in Newburgh , New York , some 60 miles north of New York City . The woman who came to the aid of the Lashaun said that the boy was both courageous and terrified . `` He kept saying , 'It 's my fault , ' `` Meave Ryan recalled . The boy , hoisted himself out of the van 's driver-side window Tuesday night , swam to shore and then flagged down Ryan by the side of a road . Lashaun was waving his arms and calling out `` Help me , help me , help me , '' Ryan said . `` He said , 'Mom just drove the car into the water , ' `` she added . Ryan said she and the boy drove to the scene , wading into the water to look for survivors . Lashaun said his mother `` just went crazy , '' according to Ryan . `` She just speeded up and went into the water , '' Ryan added , recounting what Lashaun had told her . The boy eventually recalled to Ryan that , as the car was moving , his mother climbed into the back seat and `` had all her children cradled in her arms . '' According to Ryan 's recollection of her conversation with Lashaun , he quoted his mother as saying , `` If I 'm going to die ... you 're all going to die with me . '' Lashaun told Ryan that he resisted and broke free , yelling out the window for help . Ryan said the boy told her that as he was trying to escape , `` maybe ( his mother ) had a break of reality , '' and she then cried out , `` Oh , my God , I made a mistake . '' She then climbed back into the front seat , the boy told Ryan . But it was too late . It took responders an hour of searching , using dive teams and a circling helicopter , to find the four bodies and the van submerged in eight feet of water , according to Fire Chief Michael Vatter . Ryan said the boy told her that his mother had been frantic , packing her children into her minivan and racing off , because she thought she was being cheated on . And before the incident , a relative called police reporting a `` domestic disturbance '' that police say may have involved the father of Armstrong 's children . That belief is based both on a phone call the relative received in which the relative reported hearing `` tussling in the background , '' and a history of domestic problems in the family , police said in a statement released Wednesday . Authorities declined to identify the relative . Police said Thursday that they have ruled out potential criminal charges against the father of the dead children , Jean Pierre . Police say they had previously arrested Pierre on charges of endangering the welfare of a minor , which stemmed from a February incident in which his 2-year-old son was found wandering the streets shortly after 1 a.m . The boy was found in cold temperatures , only partially clothed in wet clothing , police said in a statement Friday . Pierre was arrested three days later on February 10 alongside a woman named Shannel Baez , who police say gave conflicting accounts of being both the boy 's babysitter and his mother . Meanwhile , Newburgh Mayor Nicholas Valentine said Tuesday 's incident is certain to have `` a lasting effect on this city . '' A neighbor , Christine Santos , said she `` would never have imagined ( Armstrong ) to do this to her kids . '' `` To them little babies . I would have never have imagined . I 'm in shock , '' Santos added . Ryan said Lashaun -- the lone survivor -- is wracked with guilt that he was n't able to unbuckle his baby sister or teach his two brothers to swim . `` He blames himself , '' Ryan said of Lashaun , who told her he only learned to swim last year . `` That 's the sad part . '' CNN 's Sheila Steffen and Deb Feyerick contributed to this report .
Note : Prosecutors are treating the incident as a triple murder - suicide . Kids ' parents arrested in court after year - old found on scene . Sole survivor : ` ` Mom just drove the car into the house ''