According to BBC News
and Gulf News
the explosives weighed some 100kg and were packed with hundreds of iron balls designed to inflict maximum destruction.
The Bahraini authorities were tipped off last month and raided the towns of Salmabad and Hamad and discovered these materials. A senior police official has stated this find represents a "game changer" stating the devices "could not have been put together without help from outside the country."
The Bahraini regime has accused Iran of meddling in its internal affairs and has blamed it for the unrest which began in February 2011 with the democratic insurrection which was subsequently brutally crushed by the Bahraini authorities.
To date there has been no evidence to suggest that Iran has had any involvement in the events in Bahrain.
The Bahraini opposition has also stated that the making of bombs "is wholly unacceptable." It went on to say that it "condemned any violence in the past, present or future." It went on to demonstrate their skepticism about this particular incident stating that it found "it hard to trust this government as they have fabricated claims in the past."
Following this find the British are reinforcing security elements at their respective embassies in the region. A counter-terrorism expert informed BBC News that this find is "very serious," and "almost at the level and style of the dissident IRA."