Mohali, May 17 -- A day after two unidentified motorcycle-borne assailants opened fire at the residence of Punjabi music producer Pushpinder Dhaliwal, also known as Pinky Dhaliwal, in Sector 71, police investigation revealed that the shooters left a threatening letter bearing the name "Kala Rana" and fired nine rounds at the house.

Police suspect an extortion bid behind the firing incident.

According to the police, the same miscreants are believed to have fired shots in Yamunanagar earlier that day before carrying out the attack in Mohali.

One of the motorcycle riders has been identified as Mani Rana, the brother of Kala Rana, a known gangster currently lodged in Delhi's Tihar Jail, police sources said.

The assailants were captured on...