When prosecutor Inga Bejer Engh asked if Norwegians should truly fear attacks from two other cells, Breivik answered: "Yes."
During his cross-examination, Breivik told prosecutor Inga Bejer Engh the cells were "planning attacks" and could strike at any time.
"I am only one of many militant nationalists... The important thing is that I am not the only one and if our demands are not met -- if the Labour party does not stop deconstructing Norwegian culture -- this will happen again and again," he said.
However his claim was later rejected by the prosecution team.
"We don't think there are more cells," another prosecutor, Svein Holden, told reporters after the close of proceedings.