Pakistan's Foreign Minister Shah Mahmood Qureshi told his Iranian counterpart on Sunday that Islamabad would fully cooperate in the investigation into the attack on the Revolutionary Guard.
According to the Associated Press, Pakistani security officials said a search operation was underway in remote part of Pakistan's southwestern province of Balochistan to arrest suspects linked to recent attacks in Pakistan and Iran.
Pakistani ambassador to Iran Riffat Masood has been summoned to the Iranian Foreign Ministry, spokesman for the Iranian Foreign Ministry Bahram Qasimi said.
Jafari was addressing a large crowd gathered for the funeral of the victims of Wednesday's suicide bombing, which took place in a southeastern region where security forces are facing a rise in attacks by militants from the country's Sunni Muslim minority.
On Saturday, Iran's revolutionary chief Major General Mohammad Ali Jafari while addressing a large gathering warned Pakistan it would "pay a heavy price" for allegedly harbouring the terrorists in the country.
In a phone call with Pakistani army commanders, Bagheri asked them to "either confront the groups or allow (Iranian) forces to enter".
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Responding to a question, FM Qureshi said that Pakistan respects the sovereignty and territorial integrity of Iran.
On January 29 three members of an Iranian bomb squad sent to the scene of an explosion in the provincial capital Zahedan were wounded when a second device blew up as they were trying to defuse it, police said at the time.
Riyadh has always been an economic and strategic partner of Islamabad, but avoids indulging in the lingering diplomatic row between Pakistan and India because of its huge investments in the two countries.
"The Iranian comments that other countries are sponsoring terrorism in Iran were very unusual, Al-Jubeir said". We are voicing our protest over the increasing number of terror attacks in Pakistan as well as the recent attack on the Khash-Zahedan road...
In that incident, Pakistani security forces helped Iran recover at least five of the 12 abductees from the armed group.
The two countries agreed on close cooperation to combat terrorism in the region.