KARACHI :   Intelligence agencies will grill 43 Indian nationals who were arrested by the Pakistan Maritime Security Agency (PMSA) a day ago from Pakistan's eastern territorial waters, sources said.

PMSA had arrested these Indian citizens from within Pakistan's territorial waters in the east. They were brought to Karachi, along with their boats.

Sources informed that the suspects will be interrogated by personnel of the intelligence agencies to find out if any of them was involved in spying activity.

On Friday, Pakistan Navy checked an Indian submarine which was attempting to sneak into Pakistani waters. A day after, Pakistani troops shot down an Indian quad copter while filming Pakistani military positions along the Line of Control (LoC).