Some in Afghanistan are calling for protests today after what their government, and lawmakers in Washington DC, call a senseless act of violence.
A US soldier shot and killed nine children, three women and four men just 500 yards from a US military base in southern Afghanistan.
Officials say he is currently in custody.
General Carsten Jacobson said, "These incidents and in particular the short distance between the incidents that we've seen in the recent weeks are a burden and are of concern for International Security Assistance Force."
President Obama called President Karzai Sunday to apologize, saying the US will investigate and hold the shooter responsible.
Karzai, in a statement, calls it an intentional act that will never be forgotten.
In Washington, lawmakers say this latest incident underscores why we need to get out.
Sen. Harry Reid said on CNN's 'State of the Union' on Sunday, "Our timetable is pretty good. We're moving out, as the President said. I think that's the right thing to do."
The US embassy in Afghanistan is warning Americans to avoid large public gatherings throughout the country, and to keep their travel plans private, for their own safety.