A UN official tweeted "there are times when tears speak more eloquently than words" after being filmed crying as he talked about the deaths of Palestinian refugees.
Chris Gunness, a United Nations spokesman, was being interviewed by Al-Jazeera about the shelling of a shelter that left 16 people dead.
He became noticeably emotional as he thanked the presenter at the end of the interview before sobbing uncontrollably.
Mr Gunness had reportedly spent the day looking at evidence from the shelled site in Gaza and speaking about the site.
The clip was shared online and prompted the UN's Relief and Work Agency spokesman to tweet:
There have been two days of quiet in Gaza. No rockets or missiles, no more destroyed houses, no more ambulance sirens screaming.
A three-year-old girl has been rescued from Gaza and brought to London for life-saving heart surgery.
A small team of NHS doctors and surgeons is travel to Gaza to set up facilities and establish how best to use specialists and equipment.