French boy thrown from museum's tenth floor on family trip to London

A 6-year-old boy was in critical but stable condition after being thrown from the viewing platform on Sunday.

London (CNN)The six-year-old thrown from a 10th floor viewing platform at the Tate Modern on Sunday was a French boy visiting London with his family, according to city police.

London police are now asking for witnesses, and say they want to speak to anyone who has witnessed the "truly shocking incident" or noticed a man whose behavior in or near the art museum "seemed out of place, suspicious or worrying" early afternoon on Sunday.
Officers said a teenager who had no connection to the victim was arrested Sunday on suspicion of attempted murder. The 17-year-old man was restrained by a group of bystanders immediately after the incident, and was detained by police shortly after.
    "It would have been incredibly distressing to watch, and it may be that you left Tate Modern very quickly after," Detective Chief Inspector John Massey, who is investigating the incident, said in a statement on Monday.