The militants have assured the UN its representatives will be safe.
The militants are now in control following the evacuation of western troops.
The foreign secretary touched down in Doha hours after a brutal grilling over Afghanistan.
A UN memo addressed to staff on the ground urged them to "stay calm".
Photographs and videos online are being incorrectly attributed to the twin explosions.
"This is just a bare-faced and sickeningly cynical lie."
All foreign military forces are expected to leave the country next week – and there's already been explosions.
Panjshir's National Resistance Front is making headlines around the world.
The evacuation process is expected to be completed by August 31.
"I am not sure ‘the sea was actually closed’ is really the defence you seem to think it is."