Ashwin, who was working in an IT firm in Coimbatore, reached home in Badiyadukka yesterday morning and attacked his father, mother, grandmother and two other relatives with a machete around 2.30 pm today, Sub-Inspector Damodharan said.
Neighbours rushed to the house on hearing the screams, after which Ashwin fled the spot.
They informed the police and rushed the injured to a private hospital here, Damodharan said.
Police shifted the injured to a private hospital at Mangaluru where the condition of his mother and grandmother, who suffered head injuries, was stated to be serious.
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Ashwin was previously working in an IT company at Bengaluru, Damodharan said.
The reason for the attack is yet to be ascertained, he said, adding, the youth is reportedly a drug addict and mentally unstable.
A case has been registered under section 174 of CrPC (police to inquire and report on suicide, etc) and further investigations are on, he said.