Obama apologizes to charity for Afghan hospital airstrike

Doctors Without Borders calls for international inquiry, saying deadly attack 'cannot be tolerated'

US President Barack Obama apologized to Doctors Without Borders on Wednesday for a deadly US airstrike on an Afghan hospital, as the medical charity demanded an international investigation.

Three separate probes, by the US military, NATO and Afghan officials, are under way into Saturday's catastrophic strike in the northern Afghan city of Kunduz.