Abdul Momin Mondal, 32, of West Bengal's Murshidabad, was arrested on Sunday, a spokesperson of the NIA said.
On interrogating the six arrested from Murshidabad on Saturday, the NIA sleuths have unearthed the identities of two persons from Malda working in tandem with them, he said.
The chamber, measuring 10x7 feet, was found during a raid at the house in the Raninagar area of the district, a senior district police officer said.
The sleuths of the central agency came to know that the suspects were scheduled to receive automatic firearms and explosives from a remote pocket along the India-Pakistan border in the Valley.
NIA prosecutor Shyamal Ghosh said that they have been charged under various sections of the Unlawful Activities (Prevention) Act.
The governor alleged the state director general of police is distanced far from reality and his 'ostrich stance' is 'very disturbing'.
They were radicalised on social media by the Pakistan-based terrorist organisation and were motivated to undertake attacks at multiple places including the National Capital Region.
Ibrahim Zubair Mohammad, aged around 40, after being shifted to Hyderabad on Tuesday has been placed under quarantine at his home in Alwal here as per rules.
The militants were produced before an anti-terrorism court, which send them to a 10-day police remand.
Al-Asiri is believed to have masterminded the attempted Christmas Day, 2009, bombing of a US-bound passenger jet.
Prince Mohammed has spearheaded a string of policy changes in ultraconservative Saudi Arabia, including reinstating cinemas and allowing women to drive.
Al-Qaeda's global network remains "remarkably resilient," posing more of a threat in some regions than the Islamic State group, UN sanctions monitors said in a report today.
Al-Qaeda leader Khalid Batarfi calls for attacks on Jews, Americans over Trump's Jerusalem declaration
Batarfi said Trump's decision was a declaration of a new Jewish-Crusader war and every Muslim had a duty to "liberate" the holy city.
The suspect, Sayfullo Saipov, was shot by police at the end of the rampage in lower Manhattan Tuesday but was expected to recover from his wounds.
Rohingya militants denied any links to global terror groups today, days after Al-Qaeda urged Muslims to rally to their cause.