At least six people have been killed and nine others injured in bomb attacks at two election campaign offices in Pakistan, Press TV reported.
On Thursday, at least five people lost their lives and eight others were wounded after a bomb detonated outside the office of the Muttahida Quami Movement (MQM) party in the southern Pakistani port city of Karachi.
According to senior police official Amir Farooqi, "The bomb was planted in a motor-bike."
"All the victims were standing outside the office when the bomb exploded," said MQM spokesman Qamar Mansur.
Earlier in the day, one person was killed and another was injured after two men on a motorcycle threw a grenade at the office of Sardar Umar Gorgage, a local leader of the Pakistan People's Party (PPP) in Nushki district, situated some 170 kilometers (105 miles) west of the city of Quetta.
On Wednesday, at least four people were injured in a bomb attack outside the home of a local leader of the PPP, who is seeking re-election in next month's parliamentary election, in the northwestern city of Peshawar.
A second bomb attack targeted the convoy of another election hopeful, Israr Ullah Gandapur, in the northwestern district of Dera Ismail Khan. The attack left no casualties.
Pakistan will hold elections on May 11 for 272 general seats of the National Assembly and a total of 577 seats in the four provincial assemblies.
On Tuesday, a car bomb targeting Abdul Khaliq Hazara, the leader of Pakistan's Hazara Democratic Party, killed four people and injured 26 others in the southwestern city of Quetta.
Pakistani media say over 35,000 Pakistanis have lost their lives in bombings and other militant attacks since 2001, when Pakistan entered an alliance with the United States in the so-called war on terror.
Since late 2009, there has been a surge in militant attacks in Pakistan.