The demonstrators , said by police to number 6,000 , also urged the release of Nadarajah Muralidaran , Swiss-based leader of the the Tamil Tiger guerrillas , who has been held in a Zurich jail since April on charges of extortion .
<response> The demonstrators , said by police to number 6,000 , also urged the release of <person>Nadarajah Muralidaran</person> , <misc>Swiss-based</misc> leader of the the <organization>Tamil Tiger</organization> guerrillas , who has been held in a <location>Zurich</location> jail since April on charges of extortion . </response>