Mohamed Houli Chemlal, an alleged member of the terror cell that unleashed carnage last week in Spain, admitted to a judge Tuesday that he and the other suspects had planned a bigger attack, a judicial source told AFP.

Chemlal, who was injured in an accidental explosion at a makeshift bomb factory believed to have precipitated the attacks, confessed to police and a judge questioning him in a Madrid court, said the source, who refused to be named.