Bengaluru: Several Congress leaders in Karnataka on Thursday sought a probe into allegations of phone tapping during the previous coalition government headed by HD Kumaraswamy in which they were partners, as the ruling BJP upped the ante on the matter.

Reacting to the issue, former chief minister and Congress Legislature Party leader Siddaramaiah told reporters, "Phone tapping, I don't know. Let them investigate, let them investigate and take action against the culprits."

He later took to Twitter to say, "Phone tapping is a serious offence. Let there be an investigation on the issue & take action against those responsible, if proved."

On Wednesday, disqualified JD(S) MLA from Hunsur, AH Vishwanath who had served as the JD(S) state president and turned rebel later, accused the previous Congress-JD(S) coalition government of tapping phones and spying on more than 300 leaders including him.

As the matter snowballed into a major controversy, chief minister BS Yediyurappa had on Wednesday said, "I am observing the developments. I will discuss with the chief secretary (TM Vijay Bhaskar) and think about further action."

HD Kumaraswamy has denied allegations of phone tapping during his tenure.

"I was the one who kept repeating that that chief minister’s position was not permanent. There was no need for me to remain in and save the chair by tapping phones. Allegations made against me by some people in this matter is far from the truth," he tweeted.

Many BJP leaders including former chief minister Jagadish Shettar have directly accused HD Kumaraswamy.

"If the tapping has happened during Kumaraswamy's time you can understand how genuine he is. To cling to power and the chair (CM’s post) he has tapped phones of opponents, partner party leader Siddaramaiah and disgruntled MLAs," Shettar said.

"Those behind it, even if it is Kumaraswamy himself, action should be taken against them in accordance with law," he demanded.