Chennai, Sep 17 - Prime Minister Manmohan Singh has reiterated the central government's commitment to rehabilitation of internally displaced civilians (IDP) in northern Sri Lanka.

In his reply to Karunanidhi's letters dated Aug 14 and 17, Singh has said: 'We fully share your concern for the welfare and wellbeing of the displaced Tamil population in Sri Lanka. We have conveyed these concerns in no uncertain terms to the government of Sri Lanka on various occasions, stressing the need for them to focus on resettling and rehabilitating the displaced population at the earliest.'

On the rehabilitation assistance extended by India, Singh has said: 'Our humanitarian assistance has been substantial.