He held a review meeting as well, officials said.I shall do my best to fulfil the mandate given to the NIA for expeditious investgation and prosecution of offences relating to terrorism, a menace which affects the security and integrity of the country, Dinkar said immediately after taking over as the NIA chief.Relieving CRPF chief Kuldiep Singh of the additional charge, Gupta has taken over as a full-time chief of the agency after more than a year.