Although the devices found during construction work were practice bombs, they can be harmful. Officials said there could be more.

The unexploded ordnance, discovered during a site renovation, were described as “practice bombs” that still carry a charge and must be removed by professionals.

Children in the English town of Wooler in Northumberland are temporarily without a playground after workers found 176 unexploded World War II bombs buried underneath the play area. The first ordnance was discovered Jan.

Scores of unexploded bombs dating from World War II have been recovered from a children’s playground in northern England after a chance discovery.

More than 175 World War II-era practice bombs have been uncovered beneath a children’s playground in northern England, raising concerns that more may still be buried, officials have said, according to the New York Times.