The explosive device was activated by a bucket-wheel excavator during work on the local road.
The nine injured workers were examined by a doctor.
An investigation is under way.
ZAGREB/PETRINJA, Oct 14
(Hina) - Nine workers were lightly injured
when an unidentified explosive device went off while they were working
on a macadam road near Petrinja, the Sisak County police reported.
(Hina) ms