The device was detonated about a half hour after authorities arrived on scene.
Police said it was a homemade firework type of explosive.
They stressed there is no danger to the Downtown Wheeling area or anyone in it.
Market & 11th Streets in Downtown Wheeling were closed while police investigate a potential explosive device found on the lot where The Health Plan is expected to build.
It happened around 2 p.m. on Wednesday.
According to the Wheeling Police Department, officers were called to 12th & Market Streets after wires were reported down. A suspicious package was found in the 1100 block lot.
Wheeling Police asked nearby pedestrians to stay away from the area while they took care of the device.
This is a developing story. Stay with 7News for updates.