Police arrested a man on the charge of stabbing his wife and three other members of his in-laws' family in Tangail's Mirzapur upazila on Thursday.
The arrestee, Swapan Miah, 25, is from Goran village in the upazila.
The injured are Swapan's wife Shila Akter, 20, her father Sirajul Islam, 60, her mother Surya Bhanu, 55, and her elder sister Razia Akter, 25.
They were first taken to Tangail General Hospital and later referred to Dhaka Medical College Hospital for better treatment.
Police said Swapan carried out the attack with a chopper at his father-in-law's house on Thursday as his in-laws refused to meet his demand of Tk 50,000 as a dowry.
Hearing their screams, locals rushed to the spot and detained Swapan. Later, he was handed over to police.
Quoting family members, police said Shila was married off to Swapan, a Saudi returnee, about six months ago.
Soon after the marriage, Shila came to know that Swapan was a drug addict and that he was married before, police said, adding that she went to her father's house as he started torturing her for dowry.
Contacted, Saidur Rahman, officer-in-charge of Mirzapur Police Station, told The Daily Star that Shila's uncle filed a case with the police station against Swapan yesterday.
He will produce before the court today, he added.