Group linked to 2000 plots or attacks carried out since 1997 . Government has banned them but they morphed into other organisations . Expert says group were not taken seriously enough for too long . He says the radical Islam they preach inspires terrorists to violence .
Group linked to more than 20 plots or attacks carried out since 1997 . Government has banned them but they morphed into other organisations . Expert says group were not taken seriously enough for too long . He says the radical Islam they preach inspires terrorists to violence .