An ISIS video claims to show the killing of Mohamed Said Ismail Musallam . The militant group claims the 19-year-old Israeli Arab is an Israeli spy . A man holds a poster with pictures and names of those killed in the attack on the Jewish Museum in Brussels during a demonstration against terrorism at Place de la Bourse square in Brussels, Belgium, March 22,
An ISIS video claims to show the killing of Mohamed Said Ismail Musallam . The militant group claims the 19-year-old Israeli Arab is an Israeli spy . But Israel 's defense minister denies the allegation .