The case was registered under different provisions, including Section 7 of the Anti-Terrorism Act (ATA)
No death was reported in the incident, however, two policemen sustained minor injuries while jumping off the range of grenade fragments, said senior superintendent police (SSP) Fida Hussain.
Investigators expressed suspicions that both attacks could be carried out by the same gang involved in Liquatabad grenade attack.
The killed and the injured were shifted to a nearby hospital
One Rangers personnel sustained injuries after miscreants hurled a cracker at the law enforcing authority's vehicle in Gulistan-e-Jauhar area.
A terrorist hurled grenade on a police van of Gomal police station which injured three policemen.
According to Levies officials, unknown attackers hurled a grenade at a hotel in Pir Koh leaving nine people injured including three children.
The rangers personnel conducted raids in Lyari and Garden areas in the light of the investigation and arrested three accused Abdul Aziz, Majid and Sohail alias Sunny.
Four others wounded in attack