A residential apartment building collapsed in a mountain resort area near Islamabad on Thursday, but it was unclear if there were any casualties, police said.
The six-storey building collapsed in the town of Muree, said police official Raja Akram. The cause of the collapse was not immediately clear.
"The entire building has sunk to the ground. We can see only the top storey," Akram said.
A woman trapped in the rubble used her mobile phone to call police for help, but did not know how many other people might be in the building, Akram said.
Police and army rescuers are at the site trying to remove rubble and find any survivors. It was not immediately known how many people lived inside the building
It was unclear if the building had suffered any structural damage as a result of Pakistan's devastating magnitude 7.6 quake on October 8 that killed more than 80,000 people and left more than 3 million homeless.
There was no earthquake in the area on Thursday that is believed to have triggered the collapse.
Building collapses are not uncommon in Pakistan as a result of shoddy construction, earthquakes and heavy rain.