At least one person was killed in an explosion in Rawalpindi late on Friday, and 12 others were wounded, Dawn newspaper reported.
The explosive device had been placed in a busy marketplace, the newspaper cited police sources as saying.
Most shops were already shut at the time of the blast.
“One killed, while 12 others were injured in an explosion. The explosive was planted in an electric pole,” Rawalpindi police spokesman Sajjad ul Hassan told AFP. 
He said it was an attempt at “organised terrorism”.
Rawalpindi police chief Ahsan Younas confirmed the bomb explosion and toll.
Police and security forces carried out a major search after the explosion in the area, the Rawalpindi police wrote on Twitter.
Videos on social media and on television showed rescue workers and debris on the street.
No one initially claimed responsibility for the attack.
There have been repeated attacks in Pakistan in recent years, but the South Asian country has remained calm in recent months.
Rawalpindi, Pakistan’s fourth-largest city, is known for its military garrison and adjoins the capital Islamabad.
This is the first bomb blast in Rawalpindi since 2015, the same year the army intensified a crackdown on militants.
Analysts however still warn that Pakistan has not yet addressed the root causes of extremism.
Yesterday the Counter-Terrorism Department (CTD) issued an initial investigation report about the blast in Rawalpindi.
According to a CTD spokesperson, the blast occurred at 8.43pm near the city’s Koyla Centre, Saddar.
There was no evidence of ball-bearings found in the initial investigation, the spokesperson said.
Two carts and two motorcycles were destroyed in the explosion.