Prime Minister Imran Khan while speaking in the National Assembly on Tuesday said that Pakistan has "no doubt" that India was behind yesterday's attempted attack on the Pakistan Stock Exchange in Karachi.

"What happened in Mumbai, they wanted to do the same [in Karachi]; they wanted to spread uncertainty. We have no doubt this was done by India," the premier said, referring to the 2008 Mumbai attacks in which more than 160 people were killed.

He praised a police sub-inspector and three security guards who lost their lives while thwarting the attack on the PSX as the "heroes of Pakistan".

Editorial: PSX attack — the symbolism of the target cannot be missed

"They gave sacrifices and thwarted a major incident, which was planned by India to destabilise us," he said, adding that the attackers had a lot of ammunition and they wanted to take hostages.

"My cabinet and its ministers know that all our agencies were on high alert. Our agencies preempted at least four major attempts of terrorism and two of them were around Islamabad.

"We were fully prepared ... this was a huge win for us," he said, paying tribute to the security agencies, Dawn reported.