Celebrities post heartfelt messages after Manchester attack

Children were among 22 people killed in a suicide bombing at a pop concert in the British city of Manchester, the country's deadliest terror attack in 12 years.

Manchester terror attack: What we know

Singer Ariana Grande, who had just finished performing in Manchester, northern England, when the blast took place, tweeted that she was 'broken' by the attack.

"From the bottom of my heart, I am so, so sorry. I don't have words," the 23-year-old wrote on her verified account, which has more than 45 million followers.

Katy Perry, Taylor Swift, Lorde and Sam Smith were amongst the many to tweet their shock and support.