Guinevere Tufnell is an expert who works with young people who have experienced sad things.
Here, she gives some advice about how the American university students will be coping with their ordeal.
How will the students be reacting to their ordeal?
They will be very, very frightened. They will take time to recover and they may have nightmares. These may go on for some time.
What help will be offered to them?
Support will be given from people they trust, someone to talk to. It's helpful to talk about things. It's very normal when something scary happens to try and not think about it, but the brain doesn't have a chance to recover then. So, it's good to talk about it.
This story might have scared children here - what should they do?
Talk to someone you trust, like a parent or teacher. Someone who will be able to listen to you and help sort out what you need to do to feel safe.
Are there special services offered by hospitals?
Great Ormond Street Hospital has a special clinic for kids and families to help more rapid recovery. Some children may need some help to feel better about things.