At least 11 Somalis were killed and another 34 are missing off the coast of Somalia after smugglers forced passengers off a boat en route to Yemen last week when the engine failed.
Shamsul Bari, a U.N. human rights expert for Somalia, said the tragedy highlights the need for peace in Somalia.
"To that end, I urge the Somali authorities at the national and sub-national level to work in close cooperation with the international community, including the United Nations," he said in a statement.
The Organization of Islamic Cooperation said it reviewed Somalia's efforts to establish a more permanent government during talks with regional partners during a summit in Djibouti.
"They agreed on the importance of next week's London conference, at a time when the world had the best possibility in a decade to make progress in Somalia and tackle the problems of piracy, terrorism, conflict, poverty and famine there," said Cameron's spokesman in a statement.