This is a terrible case. I caught the end of it on the news yesterday and when I noted it was SE London I wondered if it had happened anywhere near me (not that that would make any difference); later on I learned that it was in Penge which isn't my way.
Poor souls, who would go out to a park with a little one and expect something like that to happen? We really never do know the minute nor the hour.
Thank goodness the police caught the lad responsible. He'll certainly feel the full force of the law, rightfully so, and have the rest of his life to deal with it.