An Indian Navy sailor, his wife and their two minor children were found dead at their residence in Navy Nagar area of south Mumbai, police said on Sunday.According to the Cuffe Parade police, the sailor was found hanging at his residence on Saturday night. The bodies of his wife and two children, aged two months and three years, were also found at the premises, PTI reported.Prima facie, police suspect that the sailor died by suicide, while his wife and children may have been poisoned, an official said, according to PTI. The bodies have been sent for post-mortem examination.Police are investigating the circumstances surrounding the deaths and are looking into all possible angles, the official added.The Indian Navy, in a statement, confirmed that the sailor, his wife and their two children were found dead at their residence. A police investigation is in progress, and the Navy is extending all possible assistance, the Navy said in its statement.The identities of the deceased have not been disclosed. Further details are awaited as the police investigation continues.(With inputs from PTI)