Initial investigation has discovered that drones were used to deliver weapons (Representational)

The centre has decided to hand over to the National Investigation Agency (NIA) the probe related to the recovery of huge arms, ammunition and communication hardware in Punjab, suspected to have been delivered through drones from across the border, officials said on Friday.

The decision was taken following the Punjab government's request in the wake of the state police's claim to have busted a terror module of the Khalistan Zindabad Force (KZF), backed by a group based in Pakistan and Germany, last month.

Punjab Police had said the terror group was conspiring to unleash a series of strikes in Punjab and adjoining states.

Initial investigation has discovered that drones were used to deliver weapons and communication hardware from Pakistan, a home ministry official said.

Four people were arrested from the outskirts of Chohla Sahib village in Tarn Taran district on Punjab on September 22. A huge cache of arms, including five AK-47 rifles, pistols, satellite phones and hand grenades were seized from them.

The weapons were suspected to have been delivered from across the border by the Pakistani intelligence agency ISI for jihadi and pro-Khalistan terrorist outfits working under its command, Punjab Police said.

Punjab DGP Dinkar Gupta said the module was busted following inputs gathered from sources that activists of the banned KZF had planned to carry out multiple terrorist strikes in J-K, Punjab and other states.