A court had returned Uthayakumar his passport to enable his travel for medical reason.

During Monday's hearing, his lawyer N. Surendran sought dates for September saying that his client was in London for treatment for a rare heart condition and needed time to recover and return.

On July 19, Uthayakumar launched a new political party called the Human Rights Party which he said would champion the rights of the marginalised people in all communities.

Meanwhile, a court released R. Sivarasa, an ethnic Indian parliamentarian who was alleged to have participated in a street rally last week to demand repeal of the ISA, a sensitive issue in Malaysia.

Sivarasa was one of the scores of protesters the police detained and produced before court Monday.

Rejecting a demand from several political organisations and NGOs, the government has said it will soon amend the ISA, but not repeal it.