Police on Monday conducted an inspection of the site where a nail bomb exploded during a festival here Saturday night, injuring 10 people, one seriously, police said.
The blast occurred around 10:35 p.m. at a garbage collection site during the Yosakoi Soran Festival held at Odori Park in the city's Chuo Ward.
In the explosion, Tomohiro Yasuda, 19, a freshman at Sapporo Gakuin University who is on the festival's organizing committee, suffered a serious chest injury in which a nail was removed from his body, police said.
Four men and five women were also injured.