The site of Giffords Way in Oldbury was sealed off, with workers evacuated, after the two World War Two bombs were discovered at around 3.47pm. The M5 between Junctions 1 and 2 was also closed temporarily.
Soldiers from the Army’s Ordnance Disposal were brought in to examine the 2ft-long, torpedo-shaped devices, and the area was kept closed off while work continued.
A spokesman for West Midlands Police said: "We’re at a building site in Oldbury after workers found what they believe to be two World War Two bombs.
"The site, on Giffords Way, has been evacuated and is sealed off. People in the area should listen to the officers as the situation develops.
"Soldiers from the Army’s Ordnance Disposal are on their way to examine the two-foot-long, torpedo shaped devices.
"We were called at 3.47pm today (Monday 24 January) by workers who are developing the site.
"The area will remain closed off for as long as necessary. Any important updates will be shared by @SandwellPolice on Twitter."
The roads around the site were officially reopened around 7.15pm after the area was declared safe.