Obama: Evidence chemical arms used in Syria, questions remain

President Barack Obama on Tuesday said there was evidence that chemical weapons were used inside Syria but questions remained about their use.

Again calling it a "game changer," Obama told reporters that what was still not known is how the chemical weapons were used, when they were used and who used them. He further noted that as early as last year he asked the US military to prepare options on Syria, however, declined to go into further detail. (Reuters)