President Obama asked the LTTE to surrender and the Sri Lankan government to take greater measures to protect civilian lives . Huffington post has a report based on the statement. The Whitehouse on Youtube also has the statement up, which is included below. If you want only the relevant part, see the same statement on politico.
There are competing views as to how Obama has handled the Sri Lankan crisis, Obama’s first since assuming office. See the recent articles on TIME, accusing Obama of not handling it well, and on TNR, commending the administration for handling it well.
Update : Sri Lanka Ambassador to the US, Jaliya Wickramasuriya responds to questions raised on the Obama satement to Aljazera