"Praying for London," Grande, Lovato and Jonas all tweeted, reports billboard.com.
Neon Trees singer Tyler Glenn wrote: "This is terrifying. Love and peace to London and the world quite frankly."
Singer Ellie Goulding tweeted: "Incredible work by emergency services. Another senseless attack that still won't divide us. Love you so much London."
A vehicle mowed down pedestrians on London Bridge and people were stabbed at nearby Borough Market. A stabbing incident also took place over a mile away in the Vauxhall area.
The Metropolitan Police tweeted that the London Bridge and Borough Market attacks on Saturday were declared as terrorist incidents. The stabbing at Vauxhall was unrelated to the terrorist attacks.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.