KABUL, Aug 27 (CNA) - United Nations Secretary-General Antonio Guterres condemned on Thursday (Aug 26) a "terrorist attack which killed and injured a number of civilians" near the airport in Afghanistan's capital Kabul, Reuters reported a UN spokesman as saying.

"This incident underscores the volatility of the situation on the ground in Afghanistan, but also strengthens our resolve as we continue to deliver urgent assistance across the country in support of the Afghan people," UN spokesman Stephane Dujarric told reporters.

He said that "as far as we know at this moment" there are no casualties among UN staff.

At least two explosions went off outside Kabul's airport on Thursday, hours after the United States and its allies warned of possible attacks by Islamic State on crowds gathered there trying to flee Afghanistan after the takeover by the Taliban.