 In March 1943 an ammunition dump was blown up by <unk> 's agents . The British , growing suspicious of some of the <unk> , banned them from entering Gibraltar . This forced the <unk> to ask <unk> for new personnel . A <unk> working on the Rock , José Martín <unk> , was responsible for the explosion and fire at a large fuel tank at <unk> Island on 30 June 1943 ; this mission , however , would be the first and the last for <unk> , because he was cornered and arrested by British authorities in August , when he tried to smuggle a bomb into a weapons magazine inside <unk> Staff Cave . After being sentenced to death , he was hanged on 11 January 1944 in Gibraltar by British executioner Albert <unk> . A member of an unrelated <unk> sabotage network , Luis López <unk> @-@ <unk> ( also arrested in 1943 ) was executed by <unk> on the same day . <unk> himself was put under arrest by the Spanish police and <unk> . He would be a free man again in December , when he rejoined the <unk> in Madrid , under direct orders of Wolfgang <unk> , <unk> <unk> , head of the sabotage section in Spain . After a <unk> attempt against the life of pro @-@ allied General José Enrique <unk> , <unk> by <unk> <unk> network 's agent Juan José <unk> and a meeting between Anthony Eden and the Spanish ambassador at London , <unk> Fitz @-@ James Stuart , <unk> activities around Gibraltar came to an end . 
