The newspaper said the groups want protesters to create bomb scares at London's main rail and Underground stations, which would swiftly paralyze the capital.
The protest organizers also plan to set up fake road-blocks and immobilize vehicles to increase the chaos.
The promise by Tony Blair, Scotland Yard and Ken Livingstone, the Mayor of London, of a "zero tolerance" policy to ensure that the city stays open is regarded as a challenge by the protest organizers.
"They boast that it will be business as usual on May 1, and we will show them otherwise to make our point," said one protest organizer.
Specialist police teams are intensifying their electronic warfare against the organizers to unmask the ringleaders and discover their targets, The Times said.
Detectives know that they are being bombarded with misinformation in this high-tech battle and are trying to crack encrypted e-mails that the leaders are using to discuss tactics.
Police are investigating links between British groups and a band of international anarchists called Black Bloc, which was heavily involved in the weekend's riots at the Summit of the Americas in Quebec. Three of its leaders were among the masked figures arrested during the trade summit siege.
Black Bloc was at the center of attempts to disrupt George W. Bush's presidential inauguration in January and the violent protests at the World Trade Organization summit in Seattle last year.
It has proposed joining the London demonstration and has sent ideas on how to disrupt the city.
Copyright 2001 by United Press International.
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