Ariana Grande has expressed her sorrow at the deaths of 22 people in an explosion after a show in Manchester.

The US star is thought to be physically unhurt, but has posted a tweet saying: "Broken. from the bottom of my heart, i am so so sorry. i don't have words."

The blast happened just after the 23-year-old singer had finished performing at Manchester Arena on Monday evening.

Her manager Scooter Braun has also posted a statement, saying "our hearts are broken".

The arena was packed with thousands of her fans at the time - including a large number of teenage girls, who make up most of her fan base.