The girls were killed when Sri Lankan jets bombed a children's home compound.
Sri Lanka on Tuesday shut down Menik Farm, one of the largest refugee camps in world which once housed 300,000 Tamils displaced during the country's decade-long ethnic war which ended in 2009.
Two Tigers were killed in a ground attack on Monday evening in the Vavuniya region where two soldiers were also wounded.
The jets destroyed two camps of the Liberation Tigers of Tamil Eelam in Mullaitivu district
At least 24 people were arrested by the security forces for defying the ban on celebrations, officials said.
In a conversation with R Ramasubramanian, Xavier said, "My documentary attempts to find answers to those frequently asked questions from Tamil refugees who are still in India."
The International Organisation for Migration has helped about 90,000 displaced Tamils, lodged in the Menik Farm camps in Vavuniya, to return to their towns and villages in northern Sri Lanka.
There was no immediate reaction from the LTTE in this regard.