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Italy mourns 16-year-old bombing victim

Carlo Hermann / AFP - Getty Images

A man rides pauses to read signs outside a closed shop prior the funeral service of Melissa Bassi on May 21, in Mesagne, near Brindisi. Bassi, a fashion student, died on May 19 when a homemade bomb exploded at a vocational school just as she and fellow pupils were arriving for morning classes. Five other students were injured in the blast.

Carlo Hermann / AFP - Getty Images

Flowers are displayed outside the Francesca Laura Morvillo Falcone school on May 21 in Brindisi, ahead of Melissa Bassi's funeral. Italian police have arrested two suspects over the bombing of a school that killed the 16-year-old girl and seriously injured five more teenagers.

Ciro Fusco / EPA

The coffin of Melissa Bassi, a 16-year-old Italian girl killed in a bomb attack, at a church in Mesagne, Italy, May 21.

"The most probable hypothesis is that it was an isolated act," Marco Dinapoli, the Brindisi chief prosecutor said at a press conference. Police have a facial composite picture of the suspect they believe set off the bomb that killed 16-year-old Melissa Bassi and injured five other students on Saturday. A one-minute video filmed by a camera on a food stand nearby shows a man wearing a dark jacket and sneakers leaning against a wall and pressing a button on a device.

Story: Lone bomber, not mafia, sought for Italy school attack.

More news from Italy: Aftershocks rattle Italy, residents sleep outdoors.

Carlo Hermann / AFP - Getty Images

A teddy bear and flowers are displayed in the classroom of Melissa Bassi at the Francesca Laura Morvillo Falcone school on May 21, in Brindisi, ahead of her funeral.