There have been more than 130 mass shootings across the US so far this year, including the attack at a school in Nashville, in which three children and three adults were killed.
Figures from the Gun Violence Archive - a non-profit research database - show that the number of mass shootings has gone up significantly in recent years.
In each of the last three years, there have been more than 600 mass shootings, almost two a day on average. พนันบาคาร่า