Mumbai: Days after 2008 Mumbai terror attack plotter and Lashkar-e-Taiba (LeT) commander Zaki-ur-Rehman Lakhvi was released from a jail in Pakistan, intelligence reports on Tuesday indicated that the outfit is planning to attack the city, once again.

On April 10, Lakhvi was released from Adiala Jail Rawalpindi after about six years of his arrest in the Mumbai attack case.

The city has been put on high alert and the Mumbai police have stepped up security.

According to reports, the intelligence agencies have sent a letter to the city police, saying that LeT was planning to send 8 to 10 militants to target the city.

The militants are expected to enter the city through the sea route with plans to target hotels and railway stations.

Read: US expresses 'grave concern' over Lakhvi's release by Pakistan

Meanwhile, Pakistan's Punjab government has challenged the Lahore High Court's decision to suspend Lakhvi’s detention, saying his release has created problems for them.

The government managed to keep him behind the bars under the security act for nearly four months since the trial court granted him bail on December 14, 2014.

Pakistan faced strong criticism from India over the release of Lakhvi. In retailitaion, India questioned Pakistan's commitment to fight against terrorism.

Lakhvi, a close relative of LeT founder and JuD chief Hafiz Saeed, was arrested in December 2008 and was indicted along with the six others on November 25, 2009 in connection with the case.

Read: No country should provide shelter to terrorists, says Modi after Lakhvi’s release

He and six others — Abdul Wajid, Mazhar Iqbal, Hamad Amin Sadiq, Shahid Jameel Riaz, Jamil Ahmed and Younis Anjum — have been charged with planning and executing the Mumbai attack in November, 2008 that left 166 people dead.

In 2008, ten Pakistani gunmen arrived on a boat in Mumbai and attacked two luxury hotels, a train station and a Jewish centre.

The attack had forced India to step up its coastal security and increase marine as well as aerial patrolling.