WASHINGTON, May 26 (AFP) - Firearms have surpassed motor vehicle crashes as the leading cause of death among American youngsters, with official data showing a strong rise in gun-related homicides such as the killing of 19 children in a Texas school rampage.

Overall, 4,368 children and adolescents up to the age of 19 died from firearms in 2020, a rate of 5.4 per 100,000 a dashboard by the Centers for Disease Control and Prevention (CDC) showed.

Homicides made up nearly two-thirds of the gun deaths.

By comparison, there were 4,036 deaths linked to motor vehicles, the previous leading cause of death among this age group.

The gap has been narrowing as road safety measures have improved over the decades, while gun related deaths have risen.

The trend lines crossed in 2020, the latest year for which data is available - a finding identified in a letter to the New England Journal of Medicine (NEJM) last week.

The letter's authors noted the new data was consistent with other evidence that gun violence rose during the COVID-19 pandemic, for reasons that aren't fully clear, but "it cannot be assumed that (it) will later revert to pre-pandemic levels".

The newly updated CDC dashboard shows that nearly 30 per cent of the deaths were suicides, just over three per cent were unintentional, and two per cent were of undetermined intent.