It said Adityanath should not shrug off the state's responsibility to investigate the matter by recommending an NIA probe into it.
"Adityanath should not shrug off his responsibility ... Is the political leadership of UP, including the chief minister, finding itself helpless that it cannot protect the state assembly?" AICC media in-charge Randeep Singh Surjewala asked.
"If a government cannot protect the state's assembly, how it will protect its people? Adityanath should probe the matter. This is condemnable," he said.
Earlier in the day, Adityanath informed the House that a powerful plastic explosive was found in the assembly and recommended an NIA probe into it.
More From This Section
The chief minister said the cleaning staff Wednesday found a white powder wrapped in a paper close to the seat of Leader of the Opposition Ram Govind Choudhry.
A forensic report confirmed it was pentaerythritol tetranitrate, he said.
The dog squad had failed to detect the explosive.