The Congress today alleged that Prime Minister Narendra Modi's helicopter was seen transporting a "suspicious black trunk" during his visit to Karnataka's Chitradurga earlier this week, and demanded a thorough probe into the matter.

Congress spokesperson Anand Sharma asked the prime minister to come clean and said the Election Commission should inquire into the contents of the "trunk".

He said the Congress' Karnataka unit has already filed a complaint with the Election Commission in this regard. The prime minister had addressed an election rally in Karnataka's Chitradurga on April 9.

"We saw there were three more choppers escorting the prime minister's helicopter. After landing, a black trunk was taken out and whisked away in a private car which was not part of the SPG carcade," he alleged.

Mr Sharma alleged that the trunk may have contained money. "What was there in the trunk? If there was no cash in it, let an inquiry be held, What was inside that it could not go with the PM's security detail" he said.

The Prime Minister had addressed the election rally in Chitradurga on April 9. Soon after the rally, Congress workers posted the video on Twitter asking uncharitable questions.

The BJP trashed the opposition's allegations on the black trunk as well as the Rafale deal. "These are baseless allegations, and the Congress — which is synonymous with corruption — should come clean on its own issues," said party spokesperson GVL Narasimha Rao.