At least 22 people–including children–were killed and 59 injured after an explosion at an Ariana Grande concert in Manchester, England, on Monday night.

Reports say a male suicide bomber was carrying the bomb and was killed after setting off an improvised explosive

Authorities are investigating whether the bomber was part of a wider network. The attack occurred outside the Manchester Arena at about 10:30 p.m., just minutes after Grande’s concert finished.

In the wake of the attack, Grande has indefinitely suspended her tour. She also took to Twitter to express her condolences. “Broken,” she wrote. “From the bottom of my heart, I am so so sorry. I don’t have words.”

Filed under: ariana-grande, Manchester