A law enforcement official says the shooter who opened fire in a classroom at Virginia’s Old Dominion University in an attack being investigated as an act of terrorism had a gun with an obliterated serial number.

Court documents show the man opened fire in a classroom at Old Dominion University had previously been convicted of aiding a terrorist organization.

The FBI says ROTC students subdued and killed a gunman who yelled “Allahu Akbar” before opening fire in a classroom at Virginia's Old Dominion University.