The Pakistan Foreign Office said on Thursday that it was not aware of the arrest of Jaish-e-Mohammad (JeM) chief Maulana Masood Azhar."I am not aware of any such arrest," Foreign Office spokesman Qazi Khalilullah told the media here.Pakistan announced on Wednesday that it had arrested several JeM activists and sealed its offices in connection with the terrorist attack on the IAF base in Pathankot in Punjab. Media reports later quoted unnamed sources as saying that Masood Azhar had been detained.