( CNN ) -- A former Microsoft executive and his son were aboard a turboprop airline that crashed Friday morning into two houses in East Haven , Connecticut , a family member told CNN . There has been `` no official confirmation or positive identification '' that Bill Henningsgaard and his son were on board , but there is no reason to believe that it was not the two of them , his brother , Blair Henningsgaard , said . Also feared dead in the crash were two children -- ages 1 and 13 -- in one house , East Haven Mayor Joseph Maturo Jr. said . The other house was unoccupied . National Transportation Safety Board investigators can not confirm the number of people killed , saying there are reports of four to six people dead . Connecticut Gov . Dannel Malloy said there could be as many as five people killed in the crash , including up to three people on the plane . But Blair Henningsgaard said only his brother and his nephew were believed to be on the plane . Two bodies were seen inside the home but have n't been recovered because the home is unstable , East Haven Fire Chief Douglas Jackson said at a press conference Friday afternoon . Fire consumed both houses , preventing firefighters from searching for victims , Jackson said , and the basement in the home holding at least two victims was filled with water . Maturo said the children were in one house with their mother when the plane struck shortly before 11:30 a.m . The mother escaped , he said . `` It 's ... total devastation in the back of the home , '' Maturo said . The multi-engine Rockwell International Turbo Commander 690B , registered to Bill Henningsgaard , took off from New Jersey 's Teterboro Airport on Friday morning and crashed while approaching the Tweed New Haven Airport around 11:25 a.m. , the Federal Aviation Administration said . The plane missed its initial approach , which is n't uncommon , said Tweed airport manager Lori Hoffman-Soares . But NTSB investigator Robert Gretz told reporters it was possible the plane was on its first approach . The neighborhood is about a half mile from the airport . One resident said the accident was n't surprising . `` They fly in very low , and a lot of times you can hear the engine cut off before it gets to the runway , '' she told CNN affiliate WTIC . The mayor said the airport 's close proximity to residents is n't unusual . `` It 's always a concern , but it 's something that happens in every airport , '' Maturo said . Neither the pilot 's identity nor information about how many people were in the plane was immediately available . The fuselage entered one of the homes , Malloy said . The right wing of the airplane could be seen in the smoldering wreckage of one house , and the left wing was in another house . Video from affiliate WTNH showed smoke rising from a heavily damaged house in East Haven , and what appeared to be the tail of a plane nearby . NTSB investigators will examine whether the weather played a role in the crash . It was raining at the time of the crash . Bill Henningsgaard worked for Microsoft for 14 years , beginning in 1988 . He served as vice president of sales for the western United States , Australia and New Zealand . CNN 's Jason Hanna , Chelsea J. Carter , Kevin Conlon and Cristy Lenz contributed to this report .
NEW : Two people are believed dead , Ex-Microsoft says . NTSB executive was aboard the plane , a family member says . Between four and six children , ages 1 and Friday , are believed to have been in the house . It was not immediately known if anyone was in the plane along with the pilot .