Anders Behring Breivik acquired the knowledge to carry out a bomb and shooting rampage on the internet, he told a Norwegian court today.

He said he studied case studies of al Qaida and other attacks and read more than 600 bomb-making guides.

On day five of his trial in Oslo, the confessed mass killer said he studied the 1993 bombing of the World Trade Centre in New York and Timothy McVeigh's Oklahoma City bombing in 1995 in particular.

Breivik said of al Qaida: "I have studied each one of their actions, what they have done wrong, what they have done right."

He has admitted the July 22 attacks that killed 77 people, but pleaded not guilty to criminal charges, saying his victims had betrayed Norway by embracing immigration.

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