Bomb disposal experts have been called to a mosque where a "suspicious item" was found in the grounds.
About 40 homes around the mosque in Walsall have been evacuated and the nearby area has been cordoned off.
The item was found outside the mosque in Rutter Street on Saturday night and taken inside by a member of the public. West Midlands Police said officers were trying to work out what it was.
The bomb squad ordered the nearby homes be evacuated early in the morning.
At about 07:30 BST police said people were being led from their homes in the Caldmore area and those who could not make other arrangements were being taken to Walsall Town Hall.
Police were initially called to the scene at about 22:45 on Saturday.
The force said the evacuation of the area was "precautionary and temporary while a further examination of the item is undertaken".
A 40m (130ft) section of Rutter Street remains cordoned with two uniformed Army personnel at the scene.