MDMK sources said Vaiko's car was pelted with stones and footwear by DMK supporters when he went to visit Karunanidhi, who is undergoing treatment for throat and lung infection.
The incident drew a sharp reaction from DMK treasurer M K Stalin, who described it as "unsavoury", expressed regret and reprimanded those involved.
"I condemn MDMK General Secretary Vaiko being stopped and express regret for this unsavoury incident, which happened when I was not in the hospital," he said in a statement.
He said DMK had members who could face things in a democratic manner and strictly urged his supporters not to indulge in any such activities and maintain peace.
Vaiko had been expelled from DMK in 1993 by Karunanidhi and since then has been a very vocal critic of the party patriarch.
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