Uttar Pradesh police conduct a security check at the Vidhan Bhavan in Lucknow after explosives were found on the premises on July 12. Photo: Hindustan Times

Uttar Pradesh Chief Minister Yogi Adityanath on Friday ordered the country’s top anti-terror agency, the National Investigation Agency, to launch a probe after the discovery of an explosive at the state Legislative Assembly in Lucknow.

Sixty grams of suspicious white powder was found on Wednesday by security agencies under one of the chairs at the Uttar Pradesh Vidhan Sabha. It was sent to a forensic lab for testing, according to NDTV, and on Thursday evening, it reported that it was pentaerythritol tetranitrate (PETN), which is used in the manufacture of the plastic explosive Semtex.

Yogi Adityanath was quoted as saying, “Everyone needs to be cautious related to security matters. Action must be taken against those involved. NIA must investigate this issue.”

He added, “Can we allow anyone to compromise the security of 403 MLAs?  This is PETN; this is a dangerous substance. It will be revealed who is behind this. Police verification should be conducted of every security personnel.”

Meanwhile, Deoria Police on Thursday arrested Farhan Ahmed, a student who threatened to blow up the Uttar Pradesh Assembly building on August 15, 2017, Daily News & Analysis reported.