A relative of a Samajwadi Party MLA was killed in an explosion in the legislator's house in Sarai Khawja area in Jaunpur on Friday, police said.
The man died after the blast blew away the roof of a room of the house of Jagdish Sonekar, MLA from Shahganj.
Superintendent of Police Chandra Prakash said investigations were on to ascertain the nature of the blast.
Additional Director General of Police (Law and Order) Brij Lal told newspersons in Lucknow that a bomb disposal squad has been summoned from Varanasi.
It appears that the death has been caused due to the roof collapse, Lal said adding, smell of diesel had been emanating
from the room.