Pakistani officials say that at least 23 people were wounded in an explosion near a police station in the garrison city of Rawalpindi on December 13.
Three of the casualties sustained deep wounds, while others were given medical care and discharged from the hospital, the city police said.
Senior police officer Mohammad Ahsan Younas told reporters that the blast was from a device planted on the side of the road. There was no immediate claim of responsibility for the explosion.
The area around the Ganj Mandi police station has been cordoned off and officials from the Counterterrorism Department and forensic experts have arrived on the scene.
The army headquarters and the offices of the country's intelligence agencies are located in Rawalpindi, about 15 kilometers south of the capital, Islamabad.
A similar roadside bombing struck Rawalpindi on December 4, killing one person and wounding seven outside a grocery store at the Pir Wadhai bus terminal.
In June, a roadside bomb went off in Rawalpindi's crowded Kabari bazaar, killing one and wounding 15, including three children.
Pakistan has witnessed scores of militant attacks on security forces and civilian targets in recent years.
At least eight people were killed, and 136 others were wounded when a powerful bomb blast targeted an Islamic seminary on the outskirts of the northwestern city of Peshawar in October.