NEW DELHI: After the Indian Air Force bombed the biggest Jaish-e-Mohammed training camp in Pakistan's Balakot, officials said terrorists who were trained at that JeM base used to take four major infiltration routes to enter Jammu and Kashmir to carry out attacks. India struck the Balakot camp in a major "preemptive" air strike on Tuesday killing at least 350 terrorists and trainers of the Pakistan-based terror group.

Kel, located in the Neelam valley in Pakistan-occupied Kashmir, has also been used as the launching point for the terrorists who used to infiltrate into Jammu and Kashmir.

The infiltration routes, which were often used by the JeM terrorists to enter India were Balakot-Kel-Dudhniyal in Kupwara district, Balakot-Kel-KainthawaIi in Magam forest in Kupwara, Balakot-Kel-Lolab in Kupwara and Balakot-Kel- Kachama-Kralpora in Kupwara, a security official said.

The JeM terrorists used to undergo different types of training courses like a three months advance combat course known as Daura-e-Khas, advance armed training course called Daura-Al-Raad and refresher a training programme.

Terrorists at the Balakot camp were trained in handling weapons like AK-47, PIKA, LMG, rocket launcher, UBGL and grenade. It is suspected that the camp was functioning under cover of 'Madrasa Ayesha Sadiq'.

Apart from basic training in weapon handling, the terrorists were also trained in jungle survival, ambush, communication, GPS, map reading etc, the official said.

The cadres were also being trained in swimming, sword fighting, horse riding etc.     During the training period, the terrorists were radicalised by showing propaganda videos of Jaish-e-Mohammad like hijacking of Indian Airlines flight (IC-814) to Kandahar, alleged atrocities against Muslims, a video namely 'Haan Maine Dekha Hai Gujarat Ka Manzar' on post Godhra riots and the speeches which were exhortation to the mob to bring down Babri Masjid, another official said.

In the refresher training programme, various activities like promotion of organisational work, briefing on activities carried out by JeM cadres, seven days arms training in the use of AK rifles and small arms are carried out with an intent to motivate the terror cadres.

Located on the banks of Kunhar river in Khyber Pakhtunkhwa province of Pakistan, the camp was also used by another terror group Hizbul Mujahideen.

The sources said at least 325 terrorists and 25 to 27 trainers were at the camp, the biggest operated by the JeM which had claimed responsibility for the February 14 suicide attack on a CRPF convoy in Pulwama in Jammu and Kashmir that killed 40 jawans.

The camp also offered aquatic training to its inmates, the sources added.

Located 20 km from the Balakot town, it was an important training centre for the JeM and other terror organisations and it had several structures to accommodate new recruits and facilities to train them, the sources said. Several "inspirational lectures" were delivered by JeM founder and terror mastermind Masood Azhar and other terrorist leaders on several occasions.

India struck the Balakot camp in a major "preemptive" air strike on Tuesday killing a large number of terrorists and trainers of the Pakistan-based terror group preparing to carry out suicide attacks in this country.