Four more persons were arrested on Thursday in connection with the firing incident at a private hospital here, police said.

The accused Dinesh, Raju, Lakhan and Manjeet, along with key accused Manoj, were produced before the local court on Thursday which sent them to two-day police custody, DCP (Crime) Maheshwer Dayal said.

Manoj was earlier arrested on the night of the incident, he added.

A group of seven persons had opened fire in the ICU of a private hospital here, injuring a father-son duo in the incident. While Joginder succumbed to his injuries on Wednesday, his father, who is undergoing treatment at a government hospital in Delhi, remains in a critical condition.