New Delhi, Jan. 4 -- At least two people were killed in Odisha on Sunday after a large portion of rocks collapsed at an unauthorized stone quarry in the Dhenekanal district.

According to a report by news agency PTI, the incident took place on Saturday evening when some workers were engaged in drilling and exploration of stone from the quarry.

It is currently not clear how many workers are trapped underneath the rocks, nor is it clear how the incident took place.

However, news agency ANI reported that a massive explosion was heard at the quarry before the collapse took place.

"The incident occurred last night during blasting operations," the news agency quoted Fire Department official Nabaghana Mallik as saying.

Rescue operations have...