• 2 boys, 14 and 17, had an argument
  • Dispute turned into a brawl which involved a crowbar
  • The younger boy hit the older one first
  • The 17-year-old took the crowbar and repeatedly hit the 14-year-old
  • The younger boy suffered skull fractures among other injuries
  • Older boy faces charges

An argument between two Pennsylvania school boys led into a street brawl involving a crowbar which left one of them seriously injured.

The two students from Highlands School District, aged 14 and 17 had a dispute on a school bus on Tuesday when the older boy ran out through the emergency exit when the bus stopped on a road in Fawn and the 14-year-old followed, grabbing the crowbar mounted near the bus driver as he went, US News reported.

According to authorities, the younger boy struck first when he hit the 17-year-old in the knee with the crowbar but the latter took control of the situation when he managed to get the crowbar and repeatedly hit the 14-year-old in the stomach, and head which caused multiple skull fractures and injuries.

Allegheny County police charged the 17-year-old with attempted homicide and aggravated assault.

The older boy also suffered a leg injury and was treated at the hospital.

Authorities have not yet revealed the cause of the boys' disagreement.

School bus
A boy who missed his school bus was shot while asking for directions. A school bus is pictured in Ashburn, Virginia, on Aug. 25, 2015. Paul J. Richards/AFP/Getty Images