Sunday, September 20, 1998 Published at 17:25 GMT 18:25 UK
Anwar arrested amid Kuala Lumpur protests
Malaysian police fired tear gas to disperse Anwar's supporters
Around a dozen armed policemen stopped a press conference being held by Mr Anwar and ordered television cameras to leave.
The events coincided with the first day of a state visit to Malaysia by Queen Elizabeth.
"There will be further arrests, especially the movement leaders," Kuala Lumpur police chief Kamaruddin Ali said outside police headquarters.
Mr Anwar declared that he was the people's ruler and called for the resignation of the Prime Minister, Dr Mahathir Mohamad - the man who dismissed him from the government earlier this month.
Mr Anwar's supporters then marched on the city's Merdeka Square close to the cathedral where the Queen, newly arrived in Kuala Lumpur, had earlier attended a church service.
Buckingham Palace said it was keeping the situation under close observation but the Queen is still due to close the Commonwealth Games on Monday.
Mr Anwar has taken his anti-corruption campaign across the country, and has accused the prime minister of conducting a "Gestapo-style" smear campaign against him.
On Saturday, Anwar's adopted brother and his former speechwriter were jailed for six months after pleading guilty to being sodomised by him. Sodomy is illegal in Malaysia.
Since his dismissal, Mr Anwar has been under investigation for sexual misconduct, treason and corruption.
He has denied the allegations and said he is the victim of a high level conspiracy by political opponents.