A 16-month-old boy died when his 5-year-old brother shot inside an apartment in Lafayette, Indiana, according to police Thursday, as gun tragedies involving young children in the U.S. are already dozens in 2023.

Authorities said they were alerted by a passerby to a shooting at an apartment in Lafayette, nearly 100 kilometers north of Indianapolis; when officers arrived at the apartment, they found a child dead.

The police found that the bullet eshouted the victim’s five-year-old brother“who was able to access a weapon inside the apartment,” Lafayette police said in a statement.

So far in 2023, there have been more than 60 cases in which children have been shot unintentionally, resulting in 25 deaths and 39 injuries in the US, according to numbers from the non-governmental organization Everytown for Gun Safety.

An autopsy on the little boy, Isaiah Johnson, confirmed that his death was due to a gunshot wound.

When the five-year-old shotWell, there was also an adult inside the apartment, according to police. Police have not released details on how the child was able to get hold of the gun.

Brian Phillips, Lafayette police chief, limited himself to reporting his whereabouts ongoing investigation to ascertain who the gun belonged to, adding that no arrests have been made.

There are roughly 400 million guns in the U.S., which accounted for more than 45,000 total deaths—homicide, accidents and suicides—in 2020, according to the most recent data from the Centers for Disease Control and Prevention (CDC).

For the first time this year, guns are the leading cause of death for youth ages 1 to 19, with 4,368 deaths, still surpassing traffic accidents and drug overdoses, according to CDC numbers — which don’t include children in the Lafayette.