New Delhi:WhatsApp on Monday placed multiple user accounts, including several in India, under review for up to 24 hours, temporarily restricting access to all app features. The unexpected action prompted affected users to raise concerns on social media after finding their accounts inaccessible without prior notice. Users flag sudden restrictionsSeveral affected users took to social media to express frustration over the sudden restrictions. "WhatsApp has placed several accounts under investigation for 24 hours. "This step has left people frustrated in India and several other places, and they also lodged their complaints on social media," they added.