Unexploded ordnance (13 rocket projectiles from World War II) was found at the construction site. Sappers from the Explosive Ordnance Disposal Patrol of the 23rd Silesian Artillery Regiment dealt with the matter. Police closed part of the residential road.
Update
The operation has ended. The sappers will transport the projectiles to a training ground. They will be detonated there. The road is now passable.