QUETTA, Pakistan (AP) - Bombings have killed at least 49 people in three different areas of Pakistan today.
In the deadliest of the attacks, twin blasts went off near a Shiite Muslim mosque in Quetta, killing at least 28 people and wounding dozens.
One police officer says initial reports indicated a hand grenade caused the first blast, forcing people to run in the direction of the mosque, where a suicide bomber detonated his explosives.
Radical Sunni Muslims have stepped up attacks in the past two years against minority Shiites, whom they consider to be heretics.
Earlier today, a car bomb exploded as a convoy of paramilitary troops passed through the outskirts of Peshawar (puh-SHAH'-wuhr), killing at least 17 people and wounding dozens of others. Police say most of the casualties were civilians.
And intelligence officials say a roadside bomb struck an army convoy in the North Waziristan tribal area, killing four soldiers and wounding 20.
The attacks came as British Prime Minister David Cameron visited Pakistan's capital, Islamabad, and promised to do all it can to help fight extremism.