Norwegian mass murderer Anders Breivik plotted to bomb President Barack Obama at the ceremony where he collected his Nobel Peace Prize in 2009, according to reports.
The far-right extremist told police that he planned to detonate a car full of explosives in the square next to Oslo City Hall, where Mr Obama accepted the prize in 2009, according to Norway's Dagbladet newspaper.
Breivik reportedly said that the attack would be largely symbolic as security would have prevented him from getting close enough to hurt the US president.
Breivik, 33, has admitted carrying out attacks that left 77 people dead on 22 July last year. His trial is due to begin on 16 April.