The mishap took place when a Maruti van collided head- on with a speeding bus near Beohari Railway Station here, an officer said.
All the victims were travelling in the van and were on their way to attend an engagement function at village Malpur, Beohari Police Station in charge Rajendra Mishra said.
Police said three of them died on the spot, while the fourth one succumbed to injuries during treatment at a hospital.
The deceased were identified as Rama Pal (30), his son Ansul (12), Kashi Prasad Pal (35) and Bhole Pal (60), Mishra said.
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