Chandigarh: Punjab Police have intensified their investigation into the February 16 firing incident at The Willow Café in Sector-10, summoning Angad Umranangal, son of Punjab Inspector General of Police (IG) K.S. Umranangal, for questioning. Angad appeared before officials at Police Station Sector-3 on Monday, where he was interrogated in connection with the incident. Police sources.