A cyberattack targeted Israel’s Bar Ilan University Sunday, the school reported. An internal email by the IT department said the attack was ongoing and urged staff to shut down their computers.

Israeli phone-hacking firm Cellebrite can now break into Signal, an encrypted messaging app considered safe from external snooping, it claimed in a blog post on Thursday.

According to research by Pandora, the hackers had launched an SMSC spoofing attack to hijack the SMS verification process for password renewal in the online accounts of the victims.