UN Secretary-General Ban Ki-moon is "shocked" by reports of a deadly chemical weapons attack by forces loyal to President Assad in Syria, the UN has said.
The body has also confirmed that its chief chemical weapons investigator is in discussions with the Syrian government over the allegations.
Britain has directly accused the Assad regime of gassing hundreds of Syrian civilians amid warnings only 48 hours remain to find proof.
New videos show the eyewitness accounts of four men who witnessed an alleged chemical attack on Zamalka, a suburb of Damascus.
These are the images of the remains of rockets which, according to the men stood by them, delivered poisonous gas to a suburb of Damascus.