Amateur video posted on the internet on Saturday claims to show UN obervers being escorted around the al Khalidiya neighbourhood of Homs in Syria. When gunfire is heard, the observers are ushered into a doorway for safety.
A handful of monitors has been in the country for a week as an advance party while diplomats hammered out the mandate to send 300 monitors.
ITV News cannot independently verify the veracity of this footage.
More top news
Mixed fortunes across the UK tomorrow. Still breezy across the north.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
There are reports that at least some MPs and Lords have been left unable to access their emails as a result of the attack.