Two people were killed and three others seriously injured in Ise, Mie Prefecture, on Tuesday when a power shovel fell off a truck and hit a car in an oncoming lane in which they were riding, police said.

Michiya Okano, 56, and a woman identified as Fumiko Morisaki, 75, were killed in the accident, which occurred shortly before 9:30 a.m., according to police.

Police arrested the truck driver, Hitoshi Nakamura, 48, on suspicion of professional negligence resulting in death.

Police said they believe the 8-ton power shovel tipped over and fell as the truck was negotiating a curve. The street where the truck was traveling has many bends.