Six Unrwa workers among estimated 18 killed in Israeli strike on Gaza school sheltering displaced The GuardianIsrael bombs UN-run school in Gaza sheltering Palestinians, killing 18 Al Jazeera EnglishU.N. agency says six of its staff among those killed in Israeli strikes The Washington PostIsraeli Strike in Gaza Kills 18, Officials Say, Including 6 U.N. Workers The New York TimesHamas considers US hostage deal, Gaza strike allegedly kills 6 UNRWA staff The Jerusalem Post