A scene of the bombed site. (Jaspinder Cheema)

SRINAGAR, India — At least 37 Indian paramilitary soldiers were killed on Thursday in Indian-administered Kashmir in one the deadliest attacks on government forces there, police said.

The suicide bombing outside Srinagar claimed by an Islamist group is likely to ratchet up tensions between nuclear-armed arch rivals India and Pakistan, with New Delhi long accusing Islamabad of supporting militants.

“The sacrifices of our brave security personnel shall not go in vain,” Indian Prime Minister Prime Minister Narendra Modi tweeted, calling the attack “despicable”.

The attack saw explosives packed inside a van rip through buses in a convoy of 78 vehicles carrying some 2,500 members of the paramilitary Central Reserve Police Force (CRPF).

Two blue buses carrying around 35 people each bore the brunt of the massive blast, heard miles away, around 20 kilometres (12 miles) from the city of Srinagar on the main highway to Jammu.

The Press Trust of India (PTI) news agency reported that at least 39 people were dead, while other press reports said the number could exceed 40.

Some of the bodies were so badly blown up that officials feel it may take some time to identity them, PTI reported. The convoy was bringing the troopers back from leave to rejoin active service.

It was unclear whether the van containing the explosives was driven into the convoy or whether it was detonated when the buses were adjacent.

“It was a powerful explosion. The explosive was car-borne,” CRPF spokesman Sanjay Kumar told AFP.

Photos showed the blackened, mangled remains of at least one vehicle littered across the highway.

Reports said that there were 350 kilos (770 pounds) of explosives used.

Local media reports said the Pakistan-based Jaish-e-Mohammed Islamist group claimed responsibility.

A spokesman for the group told a local news agency that the “suicide attack” was carried out by Aadil Ahmad, alias Waqas Commando, a known militant from the area.

After the attack, hundreds of government forces cordoned around 15 villages in the district the bomber came from and started searching house-to-house, a police officer and witnesses said.

The last major car bombing, which killed 40 people including three suicide attackers, was also carried out by Jaish-e-Mohammed, in 2001. The target was the local parliament building in Srinagar.

Kashmir has been divided between India and Pakistan since independence. Rebels have been fighting for an independent Kashmir, or a merger with Pakistan, for 30 years.

Last year was the deadliest in a decade, with rights monitors saying almost 600 people died, most of them civilians. Thousands more have been maimed in recent years by pellet-firing shotguns used by Indian forces.

Pakistan says it only provides diplomatic support to Kashmiris’ right to self-determination.

TAGS Indian Kashmir suicide bombing kills 37 paramilitary soldiers