Police Chief: Teen shoots four; kills self at Cleveland high school:

The gunman has been identified as 14-year-old Asa Coon. He was armed with two revolvers, a .22 and a .38. No word yet on where he obtained the guns. He was also carrying a box of ammo and several knives.

Coon had a record too…

Coon had a previous arrest last year for a domestic violence incident and police had been to his home before for incidents that involved weapons, according to McGrath.

That would be my leading guess as to where he got the weapons.