Dhinakaran, who is accused of trying to bribe an Election Commission official in a bid to retain the 'two-leaves' symbol of AIADMK, however, maintained that he did not pay any money to Sukesh in this regard, police said.
Dhinakaran reached the Crime Branch Inter State Cell office in Chanakyapuri around 3.30 PM, even as the police started by interrogating his personal assistant Janardhan.
It was only around 6 PM that Dhinakaran's questioning began and came to an end around an hour post midnight, they said.
On sustained quizzing, Dhinakaran said he had met Sukesh, who had posed as a high court judge and sought to help him in the matter, police sources said.
However, he denied paying money to the middleman, the sources said, adding the Crime Branch officers also confronted Dhinakaran and Sukesh.
Dhinakaran has been called for questioning tomorrow at 5 PM.
The leader had come under scanner after the arrest of the alleged middleman Sukesh and had since maintained having no idea about him.
Yesterday he was grilled by the police for 11 hours.
The controversial leader was earlier summoned by Delhi Police at his Chennai residence in the case.
Having been appointed as deputy general secretary by jailed AIADMK chief V S Sasikala, Dhinakaran has been isolated in his party amid moves to merge rival factions led by Tamil Nadu Chief Minister E K Palaniswami and his predecessor O Panneerselvam.
Dhinakaran later announced he would stay away from party affairs and that he could be removed only by Sasikala.
Sasikala is at present serving a four-year jail term in Bengaluru in a disproportionate assets case.
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