Malaysia is set to crack the whip on hundreds of thousands of illegal immigrants tomorrow, with a force of about half-a-million officials to be deployed to hunt them down.

The large-scale operation, codenamed "Ops Tegas", to round up, whip and deport illegal immigrants, mainly Indonesians, marks the end of an amnesty which has twice been extended at Jakarta's request.

"The government is tegas (firm). There will be no deferment," Home Affairs Minister Azmi Khalid said at the weekend.

"When they are caught this time, not only will we haul them to court but they will also be barred from entering Malaysia in future."

He warned Malaysian employers, who sometimes prefer illegal workers because they can pay them less than locals, also faced arrest and punishment under tough laws introduced in 2002.

The crackdown will be Malaysia's largest blitz to flush out illegal immigrants in three years. A similar nationwide sweep was carried out in 2002 following the end of a four-month amnesty program.

Before the recent amnesty began on Oct 29 last year, Malaysia estimated there were more than a million illegal workers in the country, mostly from Indonesia but also from the Philippines, Burma, Bangladesh, India and Sri Lanka.

Nearly 400,000, mostly Indonesians, left without facing any penalty during the first three months of the amnesty, but others have remained, clinging to jobs in the construction, plantation and service industries in the face of unemployment at home.

The planned crackdown, which will involve about 500,000 officials and civilian security force volunteers, has been widely criticised by human rights groups which say it is open to abuse.

Being humane

Indonesia and the Philippines have urged Malaysia to ensure there were no human rights abuses when it carries out the crackdown.

Amnesty International earlier this month urged Malaysia to halt the planned deportation of illegals amid fears some could face execution or torture in their home countries.

Migrants from Burma, Nepal and the Indonesian province of Aceh could be subjected to serious human rights violations if they were sent home in the crackdown, it said.

But Azmi said the government has been very humane and would ensure that the welfare of the immigrants was taken care of.

"There is no other country in the world that has come up with the amnesty program like what we have. We have been very very humane with the illegals," he said.

"The very reason we are sending them back is because we want them to come back legally. This is very, very humanitarian."

Indonesia will provide two navy vessels to take the illegal workers home. It has also set up 11 processing centres to help prepare work permit for its citizens to return to work in Malaysia legally.

Deputy Prime Minister Najib Razak in remarks published Sunday said procession of work permits for Indonesian immigrants would take only two days if there were no bureaucratic delays.

The government has said Malaysia would continue to employ Indonesians as long as they were in the country legally, and would introduce a new system to fingerprint all foreign workers to ensure that illegals were weeded out.