Websites for Israel 's Israel Radio and elections agency appeared to be down Sunday . Cyberattackers ' own website was itself hacked ; it played Israel 's national anthem . Hackers can do `` no real damage , '' Anonymous Arab cyberchief says . Group called Israeli announced attack plan Sunday .
Websites for Israel 's Knesset and elections agency appeared to be down Sunday . Cyberattackers ' own website was itself hacked ; it played Israel 's national anthem . Hackers can do `` no real damage , '' Israeli cyberchief says . Group called Anonymous Arab announced attack plan last week .