Chan says it is likely this death toll is greatly underestimated.

VOA: standard.2009.12.29

The report said military intelligence underestimated the violent response.

VOA: standard.2010.07.12

"What I think some of these terrorist group may have underestimated is that we in the west or in Russia,in this case, are perhaps not quite as soft as they might have first believed."

VOA: standard.2010.03.30