The children are with their parents, and they're kept in a different style of room so it's more of an interview during the interview process that takes place, then the transportation is facilitated over to CBSA. I wouldn't call it detention in the sense of the probable connotation of what detention is. They're with their parents while their parents go through the process. They're not taken or separated, and no undue harm is caused.
On May 3rd, 2018. See this statement in context.