ISLAMABAD - India summoned Pakistan's envoy to protest after the Islamabad High Court suspended detention orders of alleged mastermind of Mumbai attacks which killed 166 people.

A foreign ministry official said Monday Delhi wanted "to register our protest over the court order" for release of Zakiur Rehman Lakhvi, who is alleged operational commander of banned militant outfit Lashkar-e-Tayyaba (LeT).

Islamabad denies India's charge of complicity, saying its courts could not try any alleged person for lack of evidence. Indian Prime Minister Narendra Modi however said the bail order was "a shock to all those who believe in humanity world over".

Earlier in the day, the Islamabad High Court (IHC) suspended the detention orders of LeT leader. A single IHC bench comprising Justice Noorul Haq N Qureshi issued an interim order in a petition of Lakvi, who is believed to be key man behind November 26, 2008 attacks in Mumbai.

The federal government had immediately issued Lakhvi’s detention orders for 30 days under Section 3 of the Maintenance of Public Orders (MPO) after an Islamabad anti-terrorism court (ATC) granted post arrest bail to him on December 18.

Through interim order, IHC bench permitted Lakhvi's conditional release with directions that he deposit bail bonds worth one million rupees with the trial ATC and ensure his presence at every hearing. Justice Qureshi also directed a standing counsel representing federation to submit detailed reply on Lakvi's petition against his detention before January 15.

In the judgment, the IHC bench observed, "Standing counsel seeks time to reply the allegations levelled by the petitioner (Lakhvi) as he is not in position to assist the court properly therefore I have left with no other option than to suspend the detention order of December 18."

During the hearing, Lakvi’s counsel Raja Rizwan Abbasi contended that ATC granted bail to his client but the federal government issued his detention orders under Indian pressure. He said after acceptance of bail application by the ATC, Lakhvi's detention under MPO was tantamount to mockery of the court orders.

The counsel added that granting of bail is an issue of fundamental rights guaranteed by the constitution and the administration violated it through unlawful detention. He informed the court that the government had also detained Hafiz Saeed, the head of Jamaatud Dawa (JuD), after the Mumbai attacks, however, the Lahore High Court (LHC) set aside his detention.

Jahangir Khan Jadoon representing the government appeared before the bench and urged the court not to suspend the detention order. He pleaded the court to give some more time to the government. But, the judge turned down his request and suspended Lakhvi's detention orders. Later, the matter was adjourned for two weeks.

Zakiur Rehman Lakhvi is among the seven persons charged with planning and helping to carry out the 2008 Mumbai attacks. The six other men facing trial in Adiala Jail for their alleged involvement in Mumbai attacks are Hammad Amin Sadiq, Shahid Jamil Riaz, Younas Anjum, Jamil Ahmed, Mazhar Iqbal and Abdul Majid.