Photo taken on Aug. 4, 2019 shows the entrance of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the 10th floor viewing platform of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the 10th floor viewing platform of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the exterior of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the exterior of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows a closed sign notice outside the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the exterior of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)

Photo taken on Aug. 4, 2019 shows the exterior of the Tate Modern museum in central London, Britain. According to BBC, a six-year-old boy was thrown five floors from a tenth-floor viewing platform at Tate Modern museum in central London, police said. A 17-year-old boy has been arrested on suspicion of attempted murder. (Xinhua/Ray Tang)