Companies linked to Nirav Modi obtained Letters of Undertaking or LoUs, which were used to get loans from overseas branches of Indian banks, up to five guarantees on a single day, with the help of rouge employees of the country's second biggest state-run bank.
Mr Jaitley said the last fraudulent LoU was issued on May 23, 2017. During these six years, 53 genuine (non-fraudulent) LoUs were also issued to Nirav Modi Group - the first being on March 5, 2011 and last on November 6, 2017, he said.
The fraudulent LoUs had a validity of up to one year.
Payments due in January this year were against LoU issued in February last year, he said, listing date-wise the LoUs issued.
Companies linked to Modi and his uncle Mehul Choksi defrauded PNB to the tune of Rs 13,600 crore. Choksi's Gitanjali Group defrauded Rs 7,080.86 crore while the rest is attributed to companies of Modi.
Mr Jaitley said "PNB Head Office received a report suspicious outstanding unauthorised transactions from Circle Office, Mumbai on January 23, 2018."
"Immediately an investigating team was constituted which gave its preliminary report on January 25, 2018. On January 29, 2018 (January 26 to 28 being public holidays), fraud was reported to RBI and complaint lodged with CBI Mumbai," he said.
PNB informed the department of financial services, under Mr Jaitley, on February 6.