Japan has displayed an "intolerance of public criticism" with the introduction of a contentious new secrecy law, Amnesty International said Wednesday in its annual report for 2015.

The London-based rights group said the law on official secrets, which came into effect in December 2014, could "excessively restrict" the right to access information held by the authorities.

Nicholas Bequelin, Amnesty International's East Asia director, said Japan is showing "growing intolerance toward criticism and dissent."