Obama confirms US role in Libya strikes
20 March 2011 Last updated at 00:11 GMT
The UK, the US and France have begun air strikes Libya as enforcement of the UN-mandated no-fly zone gets under way.
US President Barack Obama, speaking during a visit to Brazil, said the US was taking "limited military action" as part of a "broad coalition".
"We cannot stand idly by when a tyrant tells his people there will be no mercy," he said.