Pattali Makkal Katchi founder Dr S Ramadoss [ Images ] on Tuesday met Congress president Sonia Gandhi [ Images ] in New Delhi [ Images ] and expressed concern over the killing of innocent Tamils in Sri Lanka [ Images ].

The Centre should not be a silent spectator to the suffering of Tamils in Sri Lanka, Ramadoss told Gandhi.

The Sri Lankan Tamil issue has come to the forefront of national politics after Bharatiya Janata Party [ Images ] leader L K Advani [ Images ] participated in a rally organised by Vaiko in New Delhi last week.

Popular Tamil hero Sarath Kumar is also organising a sit in dharna, to protest on the same issue, in New Delhi on February 25.