The UN said Friday it was still awaiting approval from Syria's government to reach two besieged areas, correcting information provided by the top envoy to the country. 

"The UN is able to deliver to 17 out of 19 besieged areas," said Jens Laerke, a spokesman for the UN's humanitarian office (OCHA).

Syria's government has so far withheld written approval for Al Wa'er in Homs and Zabadani in rural Damascus, the UN said, clarifying information given Thursday by envoy Staffan de Mistura, who mistakenly told reporters that approval for all 19 areas had been granted.