ISLAMABAD — There is "no doubt" that India was behind Monday"s attack on the stock exchange building in Karachi, Pakistani Prime Minister Imran Khan told parliament on Tuesday. Four gunmen armed with grenades attacked the Pakistan Stock Exchange on Monday, killing two guards and a policeman before security forces killed the attackers. India said on Monday it had nothing to do with the assault. “There is no doubt that India is behind the attack,” Khan said in his address to parliament. “For the last two months my Cabinet knew (there would be an attack) I had informed my ministers. All our agencies were on high alert,” he added. Security forces recovered AK-47 rifles, a grenade launcher, grenades, ammunition, and food the gunmen had with them, presumably planning a longer assault. The Majid Brigade of the Balochistan Liberation Army (BLA) later took responsibility for the attack. The BLA is an armed insurgent group that advocates for the independence of Balochistan province from Pakistan. Some experts say that the group has links to India. "The Balochistan Liberation Army is being funded by India," defense analyst and retired general Amjad Shoaib said. "Baloch insurgents are being supported and trained by Indian intelligence agencies. The Pakistani government expected that such an attack could be perpetrated. Authorities are now taking an action against those involved in it." — Agencies