 While a gunman took down their names and addresses, Somerville and Harris Boyle placed a ten-pound time bomb under the driver's seat of the minibus.Martin Dillon suggested in his book, "The Dirty War", that this was meant to explode across the border in the Republic of Ireland with the aim of portraying the band as republican sympathisers smuggling bombs for the Provisional IRA.As the bomb tilted on one side, clumsy soldering on the clock used as a timer caused the device to detonate prematurely, blowing the minibus apart and instantly killing Somerville and Boyle, who were hurled in opposite directions.