The National Investigation Agency Saturday said it has attached five assets as part of its ongoing probe against north India-based gangsters involved in organised crimes like extortion and murder, including that of a Punjabi singer Sidhu Moosewala.

"The properties attached include a house of Asif Khan in Delhi, a house and agricultural land at three different locations belonging to Surender Singh alias Chiku in Mahendragarh district of Haryana," the federal probe agency said in a statement.