Company notified users that 'advanced cyber actor' may have breached their devices, including Islamic State suspect under investigation by officials working with Israel's NSO Group

Report says unclear who was behind hacking, which took advantage of vulnerability in WhatsApp that NSO Group has been accused of exploiting

Israeli cybersecurity firm alerted popular messaging service to vulnerability, now fixed, which could have let bad actors send malicious message, necessitating reinstall of app

Move by Oregon Democrat comes after WhatsApp filed suit against spyware company alleging widespread abuse; NSO employees sue Facebook for suspending their accounts

WhatsApp informs Priyanka Gandhi Vadra of breach during election campaign, days after report that hack targeted officials from countries allied with US

After WhatsApp sues firm, accusing it of illicitly accessing phones worldwide, Ze'ev Elkin distances administration from the scandal

Days after messaging app sues Israeli firm for alleged cyber-espionage, report says victims of hacking campaign include government and military officials

Company accused of using the messaging service to spy on journalists, human rights activists and others

Anti-government protests sparked by austerity plans and proposed tax on WhatsApp widespread, including Hezbollah areas; 83 demonstrators and police injured

Demonstrations against rampant corruption in debt-ridden country threaten to deepen its political and financial woes