A World War II-era bomb exploded Tuesday at a construction site in the southeastern Czech Republic. One worker was injured, officials said.

The 220-pound bomb was set off by an excavator in the outskirts of Znojmo near the Austrian border, police spokesman Jan Krepela said. The worker operating the machine suffered light injuries, Krepela said.

Unexploded bombs and ammunition from World War II are still unearthed from time to time in the area, Krepela said.