The suspension of the licence of Geo News was announced by Pakistan Electronic Media Regulatory Authority (PEMRA) after a meeting chaired by its chief Parvez Rathore.
It also asked the channel to pay Rs 10 million as fine.
"The Authority, after thread-bare discussion while considering all the relevant provisions of PEMRA laws, took a strong notice of violations committed by Geo News and unanimously decided to immediately suspend the license of the said channel for a period of 15 days besides imposing a fine of Rs 10 million, to be paid before the expiry of the suspension period," PEMRA said in a statement.
The meeting was held to address a complaint filed by Ministry of Defence against Geo News for naming Inter-Services Intelligence (ISI) agency and its chief Lt Gen Zaheerul Islam for attack on leading journalist Hamid Mir, who was seriously injured in a gun attack in April.
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The Defence ministry had demanded that the licence of Geo News be suspended after it reported that the ISI was behind the attack on Mir in Karachi.
Geo TV network and Jang Group, which owns the channel, on May 26 had tendered apology to Pakistan's armed forces and the ISI for hurling allegations on its chief over the assassination attempt on Mir.
The move to suspend channel's licence came a day after Geo and Jang Group served a legal notice on the Ministry of Defence, the ISI and PEMRA for defaming and maligning the group by accusing it of working on an anti-Pakistan agenda, inciting and fuelling violence against the group, pressuring cable operators to black out Geo channels.