The United Nations is unable to keep track of the death toll in Syria because of the "complex and dangerous" nature of its civil war, a spokesman for the U.N.'s human rights office told NBC News. “If at some point, we feel that we can once again give a more accurate figure to reflect the true proportions of this continuing tragedy, we will do so, but for the time being the figure we continue to use is 'more than 100,000,'” spokesman Rupert Colville told NBC News. “This is by any reckoning a huge number of individuals to have lost their lives." According to the Britain-based Syrian Observatory for Human Rights, the death toll has risen more than 130,000 since March 2011. In a separate announcement, the U.N. said that a Danish ship departed from Syria with the first batch of chemical weapons set for removal.