Thane: A day after six people were killed and more then 150 others injured in a boiler blast in a factory here, charges of culpable homicide not amounting to murder were slapped on owners of Probace Enterprises, a police official said in Thane on Friday.

"We have sought help from the factory inspector and other departments to determine the exact cause of the blast and fire," said an official of Manpada police, which is probing the case under the direction of Joint Police Commissioner Ashutosh Dumbre.