Bahrain blows up parcel of suspected explosives from UK
The parcel was originally thought to contain explosives but on examination, the ministry of interior said it contained only bomb-making materials.
Officials in Bahrain have told the BBC they believe the device was a dummy to "test their defences".
The UK Foreign Office says it is aware of the reports and is checking them.
Meanwhile, riot police in the capital Manama fired tear gas and rubber bullets at hundreds of protesters trying to reach a key landmark.
The Shia-majority protesters - who are demanding more rights from Bahrain's Sunni rulers - were trying to reach Pearl Square, the centre of demonstrations which erupted earlier this year.
They began marching after ceremonies commemorating the death of the Prophet Muhammad's grandson Hussein, in 680AD, a key event in the Shia faith.
There were no immediate reports of injuries.
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