A North Babylon teen was hospitalized Tuesday after police say an improvised explosive device he created went off in his hands.

Federal ATF agents and the Suffolk Arson Squad searched 17-year-old Vincent Pizzonia?s home for hours Tuesday. Authorities say they found bomb-making materials and photographs of the Columbine school shooters on Pizzonia?s wall.

Police say the explosive device Pizzonia created was made from steel tubing model rocket propellant and gunpowder belonging to his father, a retired NYPD officer. Pizzonia told police he just planned to set it off in his backyard.

Some students at North Babylon High School say they?ve heard Pizzonia has threatened violence against the school.

The school was put on modified lockdown Tuesday, which meant no one was allowed to enter or leave the building until dismissal. Police say no specific threat was made against North Babylon High School.