New Delhi, Feb. 14 -- The top diplomat overseeing the U.S.-brokered ceasefire deal in Gaza said Friday that continued violations of the agreement pose major obstacles to the Palestinian committee expected to oversee postwar governance and reconstruction.

Nickolay Mladenov, who serves as high representative for Gaza for the U.S.-established Board of Peace, spoke during a panel discussion at the Munich Security Conference. The international board, established by U.S. President Donald Trump, is set to meet next week.

The transitional committee, made up of Palestinian administrators, has met in Egypt but has not yet entered Gaza. Mladenov said it won't be able to do its work unless Hamas, the militant group that has governed Gaza since 2007...