"Today Zakiur Rehman Lakhvi filed a petition in the Islamabad High Court, challenging his detention under Maintenance of Public Order (MPO)," Lakhvi's counsel Raja Rizwan Abbasi told PTI.
"Legal requirements have not been fulfilled in the detention of Lakhvi. Besides, the legal grounds the government has cited in the matter are not maintainable," he said.
The court will fix the date for hearing of the case on Monday.
Lakhvi on Wednesday had submitted an application with the Pakistan government seeking an end to his detention under MPO.
Abbasi said the government rejected Lakhvi's plea seeking his release from detention under MPO earlier this morning.
"We had earlier made it clear that if the government did not entertain our request to free Lakhvi we would move the high court and challenge his illegal detention," he said.
Meanwhile, the government has so far failed to file a plea challenging bail to Lakhvi as the courts closed for a two-week winter break, citing that the judge has not released the copy of the order.
The decision to grant bail to Lakhvi, 54, drew sharp criticism from India and surprised many for its timing, just days after Taliban massacred 148 people, mostly school children, in Peshawar.
