The United Nations' top human rights official says he will closely watch how special peace tribunals set up as part of Colombia's peace process operate to make sure people who committed serious war crimes during the long conflict are held accountable.

U.N. High Commissioner for Human Rights Zeid Ra'ad Al Hussein met with government officials and the Revolutionary Armed Forces of Colombia during his visit this week to the South American nation.

He said Thursday that while Colombia has made progress on some areas of human rights, in other areas there has been virtually none. He said he was "shocked" by the high levels of rural poverty in Colombia's predominantly black state of Choco.

He said the peace accord is an opportunity to address long-neglected social ills and inequality.