New Delhi: Prime Minister Narendra Modi on Friday warned Pakistan that the attack such as the one on CRPF soldiers in Pulwama will not weaken India and those responsible will have to pay a "very heavy price".

In a hard-hitting speech, Modi said security forces will be given complete freedom to crack down on terrorism, and the "blood of the people is boiling".

"Our neighbouring country thinks such terror attacks can weaken us, but their plans will not materialise," he said at a function to flag off a new semi-high speed train from Delhi to Varanasi.

On Thursday, an explosives laden truck rammed into a CRPF convoy in Pulwama outside Srinagar killing at least 37 soldiers in one of the biggest terror attacks in recent years.

"My condolences to families of those martyred in the Pulwama attack, those behind the terror strike will pay a very heavy price," Modi said.

"I am thankful to all nations which condemned the Pulwama attack and urge them to come together to crush terrorism," the prime minister said.

The Prime Minister was speaking after flagging off the Vande Bharat Express from New Delhi railway station. This the fastest train in the country that will run between Delhi and Varanasi. This train will run from February 17 for the general public. People have begun booking tickets for the Vande Bharat Express.

Vande Bharat Express will depart from New Delhi at 6 pm and reach Varanasi Cantt at 2 pm. On the same day, the train will run from Varanasi at 3pm and reach Delhi at 11 am. Apart from Monday and Thursday, the train will run for five days a week.