Monét, 24, opened for Grande at the Manchester Arena stop of Grande's Dangerous Woman tour, and tweeted about the suicide bombing.
"I wish I could say that I am ok, but I'm not," she wrote. "Safe? Yes, but heartbroken that loved ones who came to have the night of their lives ended up losing them. They weren't safe. I will never understand this hate! This was supposed to be their safe place! I'm so hurt and frustrated I don't know how to handle this and I can't smile and I feel useless I'm sorry. Lord help me find strength."
Rapper BIA, who also opened for Grande on Monday, shared her thoughts on Twitter as well.
"My heart is heavy today as I extend my prayers to the children and families affected by last night's horrible tragedy in Manchester," she wrote. "We are sending our love to all of Manchester during this incredibly difficult time. We ask each of you to join us in keeping all who are suffering in your thoughts and prayers."
Chief Constable Ian Hopkins of the Greater Manchester Police held a press conference on Tuesday, and said that 22 people have been confirmed dead and 59 injured, calling the weapon "an improvised explosive device." Several of the deceased include children.
The Greater Manchester Police also shared on Tuesday that an arrest has been made in connection to the incident, a 23-year-old man in South Manchester. According to several reports, more arrests are expected in the coming days.