The deceased were identified as Sanjay Kumar Mandal (29) who hailed from West Bengal's 24 Pargana district, his wife Rinki (25) and their baby daughter.
Police said a fellow CISF jawan visited Sanjay's house yesterday afternoon. As nobody responded despite knocking on the door and pressing the door-bell, he climbed on the balcony of the house and peered through the window to find three hanging bodies.
CISF officials said that Sanjay had faced departmental inquiry some days ago when he was found to be carrying Rs 1,400 with him while on duty.
CISF jawans are not allowed to carry more than Rs 500 on them while on duty, so the extra cash was considered as bribe money and inquiry was started.
But later it was established that the money belonged to someone Sanjay knew.
Police said prima facie it was a case of suicide, and further probe was on.
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