U.N. investigators in area probing Aleppo convoy attack: Eliasson

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"We know that it is a difficult mission because it a mission where access is very difficult. We know manipulation of evidence can take place and evidence can disappear," Eliasson told a news conference in Geneva. "An attack of this nature constitutes without any doubt a war crime."

"We hope to have enough information to have solid investigation presented as soon as possible," he added.

(Reporting by Stephanie Nebehay, editing by Tom Miles)