Malaysian authorities on Saturday arrested an anti-government blogger, an opposition politician and a journalist under a controversial security law, triggering apprehensions of a crackdown on dissent. All the three were held under the Internal Security Act (ISA), which allows indefinite detention without trial, media reports and officials said.  Police first picked up Raja Petra Raja Kamarudin, who through his popular website 'Malaysia Today', has in the fast few months deeply upset the Abdullah Badawi government publishing numerous claims about top government leaders, which have been dismissed as lies.  Home Minister Syed Hamid Albar said the blogger has wrote a piece insulting Islam. Hours later, authorities detained Tan Hoon Cheng, a reporter for Chinese-language Sin Chew Daily News. Tan had reported a remark by a ruling UNMO leader against the ethnic Chinese community which sparked a major race row. Malaysian media reports also said Teresa Kok, a lawmaker from the opposition Democratic Action Party, had also been arrested under the ISA. Kok reportedly complained about the noise of morning prayers from a mosque in her electorate. "Is Malaysia in the grip of another ISA madness, akin to Operation Lalang 21 years ago when there were mass arrests under the ISA and closure of three newspapers?" said opposition lawmaker Lim Kit Siang. DAP secretary-general Lim Guan Eng called the arrests a "mockery of democracy" and a desperate bid by the government to "cling on to power" amid threats by opposition politician Anwar Ibrahim to topple the government.