Authorities arrested a Pakistan-born U.S.citizen, Faisal Shahzad, two days after an explosive device inside a sports utility vehicle failed to detonate in Times Square on May 1.

VOA: standard.2010.05.14

But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

Mr Price said the bomb squad found the remnants of a small explosive device - "the first of a series of similar devices to be received in the post over the course of that day".

BBC: NEWS | UK | Accused's home a 'bomb factory'

Police defused a second explosive device in the city centre, which was seriously damaged by the blast.

BBC: NEWS | Europe | Three killed in Turkey bomb blast

In December 2012, German police discovered a crude improvised explosive device placed in a bag on a platform at the main railway station in Bonn.

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