The Tamil Nadu Assembly in its special meeting adopted a resolution against the Centre's decision to participate in the Commonwealth Heads of Government Meeting at Colombo.
The resolution reiterated that India should totally boycott the Commonwealth Heads Summit which is to be held from November 13 to 17 and also the External Affairs Ministers' meeting.
The resolution also emphasised that indirectly it meant that Sri Lanka had the support for indulging in acts of violence against the Tamils.
It also said the assembly had urged the Centre to take steps to get Sri Lanka suspended from Commonwealth till it took action to ensure that Sri Lankan Tamils were given equal rights on par with Sinhalese and were able to live independently.
"But in total contradiction to these demands, the Centre has announced that an Indian delegation led by External Affairs Minister would attend the CHOGM. The assembly expresses its deep regret to this," the resolution read.
Earlier on Tuesday, demonstrators blocked trains in Tamil Nadu, and particularly in state capital Chennai, in protest against the CHOGM Summit, even after it was announced that Prime Minister Manmohan Singh would skip the meet to be held in Colombo.
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Many political parties and some ministers within the ruling Congress party were advocating a total boycott of the event over alleged war atrocities of the Sri Lankan Army in its war against the Tamil Tigers.
The Sri Lankan government, which defeated separatist Tamil Tiger rebels in 2009, is under increasing pressure from the international community to try those responsible for rights abuses during the nearly three-decade-long conflict.