Pakistani television shows emergency services racing to the scene of an attack on a mosque near military headquarters in Rawalpindi.
Shortly before 1100 GMT, emergency crews were saying at least 39 people have been killed and 35 more wounded.
The alarm was raised when shooting and explosions were heard after Friday prayers.
Details about what happened were not immediately clear.
The latest violence comes after U.S. President Barack Obama urged Pakistan to crack down harder on militants along its border with Afghanistan.
Pakistani forces also carried out a major offensive against Taliban insurgents in South Waziristan in October.
The militants responded with a wave of bombings which have killed several hundred since then.
Who is behind the latest violence is not yet known.
Get the 4.5 million illegal afghan out of pakistan send them back to india or to khurasan, or put them in barbed wires camps as Iran did
busola100 2 years ago
Its a saying that Allah give oppurtunity to everyone to every one today to bloody kaffar have oppurtunity soon MUSLIMS will become the power like fish eats ant in sea and when the flood comes same fish are eaten by ants.Think duffer nd just prepare 4 the future.i just wish to listen these comments 4m u under the shade of my gun
sidarth86 2 years ago
Isha Allah, A Eid Qurbani of Muslims as a Tofa to Allah.
Blood thirsty Allah always like Islamic Terrorism, Killings, Death, and Destruction.
htgajjar 2 years ago