Ahmed is a resident of Sahiwal, some 200-km from Lahore, the provincial capital.
According to police, an FIR has been registered against Ahmed under section 295-A of the Pakistan Penal Code and section 16 of the Maintenance of Public Order.
Police said Ahmed told his followers that Sufi saints had already foretold about his "appearance".
Police are also investigating whether he made this claim because of any mental impairment. Police also recorded the statements of some of his followers.
An imam is the head or leader of an imamate. Imam Mahdi, according to the Islamic belief, will appear on Earth before the Day of Judgment.
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