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 For a moment, he holds back the tears, coughing and blinking hard, trying to maintain his professional composure. 
 
 Then it is all too much for Chris Gunness, a United Nations spokesman, who broke down in a television interview with al-Jazeera as he described the devastating human impact of fighting in Gaza . 
 
 The clip offers a painful insight into the emotional toll among aid workers - and in particular that of a UN agency trying to protect Palestinians in schools, designated as shelters, which are still being hit by missiles. 
 
 Mr Gunness, a former BBC reporter now working for the UN's Relief and Works Agency, had spent the day examining evidence and describing yet another attack on one of its sites. 
 
 Israeli tank shells had slammed into a school sheltering some 3,300 homeless Gazans, killing 16 refugees and staff, provoking world wide horror. 
 
 Mr Gunness condemned the attack, ending: "The rights of Palestinians - even their children - are wholesale denied. And it's appalling." 
 
 For a moment, he keeps his cool. He blinks hard and looks relieved the interview has ended. 
 
 He squeezes out a brief thank you to his interviewer, saying "My pleasure" in a shaky voice. 
 
 Then it is all too much. He presses his hand to his eyes and breaks into sobs. 
 
 A colleague rushes to comfort him as the camera is pushed away, while the sound of wailing anguish grows. 
 
 Even for a veteran of Gaza's troubles it is all too much. 
 
 Video courtesy al-Jazeera 

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– After analyzing evidence of missile attacks on Palestinian shelters in the Gaza Strip, United Nations spokesman Chris Gunness appeared in a live television interview with al-Jazeera to discuss the "appalling" impact the Israel-Gaza conflict is having on human lives. "The rights of Palestinians—even their children—are wholesale denied," he said, in reference to some 20 people killed by an Israeli attack on a UN-run school, the Washington Post reports. As the interview neared a close, however, the toll of the conflict became too much for the former BBC reporter, who, after getting out a quick "my pleasure" to his interviewer, broke into sobs, the Telegraph reports. The Post notes that the attack on the school marks the sixth time a UN Relief and Works Agency site has been hit during this campaign. Afterward, Gunness himself tweeted the interview, noting, "There r times when tears speak more eloquently than words. Mine pale into insignificance compared with #Gaza's." He continued, tweeting "My heart is broken for those fragile lives" and "The humanity of the children of #Gaza should humble & shame us all." In the latest from the conflict, Benjamin Netanyahu has vowed to destroy Hamas' tunnels "with or without a ceasefire."